Well, gratz on your achievements.
You did the overgearing on a week, i did it too, some of my friends, but i'm sure it's not the baseline.
Most people are still having problems, others are still leveling, can you imagine that?!
The biggest 'yay' i'm finding is that people are really learning how to do their jobs. I usually run with 2 close friends, and we pug 2 dps. As we got to our first heroics, it was a pain asking for CC or even following marks. Now people are getting used to the new mechanics and things are going smoothier.
As on 'what to do now', the obvious step is start raiding. That is the expected flow of the PvE of the game. If you dont like it, or wont do it, try pvping, arenas, doing loremaster, fishing, hunting rare spawns, AH speculating, farming money, level new professions, exploring, getting exalted with all available factions, leveling an alt, going for 'the insane' or even idling on a major city and trolling on trade. Seriously, WoW is one of the few games that is HARD for you to say that you 'have nothing else to do'.