You know, after dungeon leveling with my healer.. I really REALLY appreciate how much better blizzard got with their dungeon design later in the game. I mean, yeah everything is more streamlined and the bosses aren't just regular mobs with higher health pools later on, but the thing that killed me and really made me practically beg for outland was the dungeon length! I mean, alot of those instances take freakin' forever to finish... Sunken Temple... Gnomeregan...Wailing caverns.. >_<
Although in retrospect, it also makes me realize how spoiled I've become. XD When I first played vanilla wow, I remeber it taking like 3 hours to clear an instance, with breaks and planning and crowd control.