PvP with my PvP guild is my endgame. Raid Finder will be where I will check out the raids just for the story. Only "raiding" I do nowadays is soloing old raids for achievements, gear, and mounts. A lot more fun than progressing slowly through the new tiers with tight schedules and likely getting stuck on a boss for ages because the guild has no clear direction or idea how to pull it off.
I've done hardcore raiding back in WotLK (Naxxramas 2.0) and I got sick of it after just one tier. I'm not going to bother chasing after new guilds again every time I want to make some progress just to be thrown off the team once that guild has decided to downsize. PvE guilds from personal experience have been completely unstable and unreliable to me, so I just stuck to PvP and haven't looked back since.