I still play, but I got burnt out on raiding at the end of BC. I just got burnt out doing BT over and over and over again for months and months. It has become my least favorite raid instance other than MC, the place is crap. Poorly designed, way too long, too much trash, boring boss fights. Doing that instance killed raiding for me period. After the MONTHS we waited for new content Sunwell finally came out, and that was enjoyable. Finally some high paced fights, first since Kael. It was a good instance, but the damage had already been done.
Once Wrath came out and raiding stopped I realized I had no desire to continue and I'm glad I did. Naxx is terrible (I PuG it occasionally when my guild does alt runs or whatever for quick gear and badges). Far too easy, half my guild pretty much quit because of that instance. They came back for Ulduar, and that has piqued their interest, but hardmodes are a fundamentally flawed design for any serious raider. Nobody feels as good when you down a boss you kill in a few hours, and nobody really cares for doing the same exact thing, only a little harder. Gone are the weeks and weeks spent on C'thun, the Four Horsemen (in vanilla) or Kael pre nerfs and because of that, gone is the sense of accomplishment and excitement.
Now I am a pvp arena fag, and I love my precious free time =D