#1 - Dec. 3, 2010, 7 p.m.
Many people are quitting their alts around 58-60 because it feels so slow moving through that content after the excitement of the new quests. It's kind of weird going through all these high-tech (vehicles, phasing, etc), fun quests and then transitioning to Hellfire Peninsula where the highlights of the zone are bombing quests.
It's very grindy getting back to up-to-date content in WoTLK.