I just went through all of this, too and even though this thread is a few months old, I think more and more Windows Phone loyalists will be wondering the same thing when they finally switch to Android or iPhone. I resisted as long as I could, holding out hope that the Surface Phone release announcement would come at any moment. My final generation Microsoft Lumia stopped charging fully and would constantly crash and reboot if it was unplugged. I coped with the frustration & inconvenience because I had a loaner Android once that I thought was just a jumbled mess and I didnt wanna get sucked into the Apple Cult when all my other devices are Windows based (and, man, do I loathe iTunes!
Even more than I deplore Google Chrome or the intrusive nature of all the Google software, for that matter! My 3 major concerns were: 1) Possibility that my vast amount of contacts wouldn't transfer from WP to the competitors' OS and I'd have to enter them all by hand before my WP finally corpsed 2) Microsoft apps that I use every single day, such as OneNote, OneDrive, MSN Weather, Here Maps, Edge browser, and Cortana wouldn't be available on my new phone and would be losing the connectivity I had between devices when using those Microsoft apps. And finally, 3) that I would be losing the clean, organized, completely customized home screen and super user friendly interface that I loved about my WPs that I had been using since 2010. After getting my new Galaxy S9+, I soon learned that even though the various transfer apps for exporting/importing contacts/files/pics didn't work, there is a pretty simple solution by saving your sync'd contacts from your Microsoft account and exporting them over to a Gmail/Google account then syncing your new phone. Easy as pie! I used OneDrive for 8 years also, so all my pics and such were saved there, so no need to stress. Especially since my 2nd concern of losing those important apps was really no concern at all. All my fave Microsoft apps were available in Google Play, even a Microsoft Launcher that, though it isn't as nice, or simple, or clean as the WP home screen (it still looks like someone's cluttered home computer screen with EVERY damned thing saved to the desktop! Annoying) it comes with Cortana, Edge, OneNote, Word, PowerPoint, Excel, and more built in. There are certainly things I miss about my WP (still can't figure out how to make Cortana, Bixby, or the dreaded privacy pirate known as "O.K. Google" function hands free in my truck, which was virtually automagical with my Cortana Powered WPs). I also don't like that I have to constantly disable and, for whatever reason, disable again a couple days later garbage like Facebook and Google Chrome that require unencrypted, uninhibited, free access to dig into any part of your phone they want for whatever reason they decide on and operate your cameras, microphone, GPS, etc without your knowledge.
On the other hand, I was two years due for an upgrade and the technology on this latest Galaxy completely blows my ol'WPs away. Microsoft pledged not to develop anything new and exciting for existing WPs and 3rd party apps I was using on WP were dying off at an alarming rate, so it felt like they were sorta pushing us off our Windows 10 phones so they could stop supporting them/us as soon as possible ala Zune, Groove Music, etc. Speaking of, the only actual app that I miss that you can't get from Google Play is Microsoft Movies & TV as I have a ton of purchased content from my Xbox, WP8 & 10, my PC, and my Surface Pro that I enjoyed having mobile access to. However, the Google Play store is far superior when it comes to the variety & sheer volume of apps available... but it seems you have to be MUCH MORE CONCERNED with sketchy 3rd Party apps being loaded up with nasty adware, ransomware, etc, so I've only downloaded apps from reputable big name sources.
One last bit of opinion on Android vs WP before I stop my ramble... one of the other commenters here said that "You should embrace Google". I wholeheartedly disagree. Don't give up your privacy for convenience. I have been operating with Google Home, Google Chrome, Facebook. Google Music, Google Movies, the Google & Samsung cloud storage, etc, all disabled for a couple months now. It has not soured the experience one bit. Just as a bit of supporting evidence to my claims that Google are world's worst privacy pirates: if you used WHATSAPP on your WP10, all the content back ups were saved encrypted so no one could hack in to the cloud and rip them off. On my Android however, the only back up storage location option for WhatsApp is to Google's cloud storage, even though my preferred Cloud is ONEDRIVE, of course! I have access to the Samsung Cloud also, but it doesn't give you the option to choose one of the other Cloud storage providers. Here's the sketchy kicker: When you go through your settings, you'll see a disclaimer that states that if you back up to Google, your convos and assorted media shared across WhatsApp will be stored unencrypted! Obviously, this is so Google can have access to a messenger app that is known for its Boehemian Grove-esque attention to privacy and unwillingness to cooperate with law enforcement or the government when they've tried to seize WhatsApp user data in the past. Don't give the real life Big Brother free access to your personal information!! Think before you give apps permission to use your camera, mic, email accounts, messaging, contacts, or to view your photos/videos!!! I couldn't imagine the anxiety the owners of Pixel2s must feel knowing Google has a backdoor into EVERYTHING on their phones!
Enjoy your new Android! After some initial frustration and a bit of a learning curve (the side buttons still vex me! The difference in layout is pretty uncomfortable for single handed operation!)... until Microsoft decides to FINALLY release the Surface Phone, that will be far superior to any Android or Apple mobile device!! I know, I know... VERY wishful thinking! Haha! I know you're all wishing along with me!! Hope ANY of this was helpful! Cheers!