How is the category insane? My phone tile wouldn't get used anymore. I don't shower with my phone, but I know when I've missed a call by not looking at it when it rings.
Do you not realize that if the Phone/Messaging/Email tiles were some static tiles that they would immediately jump to your most tapped tiles? Obviously, the lock screen would help, but just because you don't tap a tile doesn't mean you don't "use" it. That's the beauty of the OS. Fill up your top 8 with none of the core OS tiles and see how much you want to look at those core OS tiles. Now, why would you put any of those tiles into some inane categorizing system?
Categories [Home] phone, me [i hate this tile], calendar, messaging, weather, mail, people
[Social]Gleek, FB, metro.am, IM+,Linked, Marketplace, MISO, Song Tweet
[Web] IE, WPC, WMPU, Engadget, ESPN
[Media] Zune, SuperTube, MP3Tube, Noka Musi Picture
[Games] about eight games
[Contacts] four
[Misc] Random apps
Unless you remember exactly where your app is at and remember just the right swipe to use to get to it, I think groupy is handy.
The flow nonstop icons gets dull to me. So I use groupy to for a break up from time to time. I think goupy will be even better once WP7.8/8 is released.