I did all the End Time dungeons when they were released. They were probably the best time I had multiboxing WoW. Also the most frustrating.

Challenge Modes replace that now... I truly wish I had done these way earlier. I spent too much time in LFR on that stupid legendary cloak that in hindsight was totally not worth the trouble.

WoD will bring some focus back to 5 mans which is good for me. That's always been my focus. PvP isn't really my thing in the long run though I don't run from it.