I do have to agree that it feels somewhat awkward to be playing on a high populated server, with a 30 min login queue and go by and quest in zones where you will only see a handful of other players. It's not like I want the horrible experience from past expansions where you really need to compete for quest items and mobs. But I can't shake the feeling that Blizzard took it a step too far this time around.
The "worst" thing is that the zones have so much content aimed at high population. I've done three out of four zones already, and this is right after launch so the amount of players playing should be at it's peak and I'm on one of the most popular servers having 15-40 min login queues every evening since release and yet I have killed way too many rare mobs all by myself because there was no one around. That just doesn't feel right to me.