Those number aren't quite right, actually. All Warzones are about ~15 minutes, and the exp they give is varied based off level, length of the game, how well you did, etc. A 'standard' quest really only takes 10 minutes, but varies as well. You can also pick up multiple quests which have objectives close to another, and that'll give you some quick exp. Space and PvP dailies give a lot more than 8-10k exp because when you finish one, you're actually finishing two quests (but again, the exp varies).
I skip heroics. Or skipped, rather. I just hit 50.