1. I have a REAL problem with the Bloodcursed quest. No, not the Azshara statue bug, but the fact that you have to swim so far down to kill the Voyagers. Yes, you have the little water-breathing spell, but I have such a huge fear of drowning that I find myself panicking if I'm under water for too long.
2. THE SPIDERS ON BLOODMYST ISLE ARE HORRIBLE. I didn't think Blizzard could make spiders any worse than they are in ZG, but OH MY GOD. *cry*
Do any of you also have weird, strange or irrational fears that get triggered by quests/beasties in WoW? :D