Welcome! I've been a WP8 user for a couple years now after coming from 4 generations of iPhones. I love my Nokia Lumia 920 and really love my Lumia 1020! I haven't missed the iPhone one bit... I never used Google+ or hangouts so no missing anything there. (don't even know what those are) all I know, is WP has everything I need and then some. I think the higher end Windows Phones would win you over with their features. I mean, the 41MP PureView camera in my Nokia Lumia 1020 is simply amazing! Nothing from Apple or Google even comes close! All the apps I need are here. And the OS itself is the most solid, fluid, and intuitive OS you'll ever use. Trust me, once you get used to it, you'll never look back!
So, what is Google+ and Hangouts anyway? A social platform like Facebook? *shrugs shoulders* Why would anyone need that?
Whatever it is, the HTML5 browser (IE10) on Windows phone 8 should work fine with it. Who needs an "app", when you can pin the actual mobile or desktop site right to your start screen.