Most forms of PVP (other than the Duel Circle at the Wolves' Den), especially The Feast. I have absolutely zero interest in any form of structured PVP (I did Borderlands Ruins ~ Shatter with my boyfriend once simply because he bugged me enough to try it, but I realized I'm just not cut out for it) so I can quite honestly say that is one thing I will never end up doing.

Really, anything 'end game' related is something that does not interest me either, particularly raiding (I only really do raids long after they've ceased being 'end game' for completion's sake once or so and then never again). I'm quite happy doing things solo or at my own pace - I'm really a casual player these days.