I'm just following a quest stacking thing.
The Zygor guide, which is pretty much a waste of money with how they implemented quests.. would have been worthwhile, if they were random in what you could take and when (like BC/WotLK).

Anyway, have done every quest in every zone.
Some are annoying, many are not.
Hyjal on opening day was the most annoying.
I've had slow collections in every zone, but nothing that bad yet.