I actually saw a few places specifically for grinding, first of which is where nymh the first to level 80 behind athene.
http://www.mmo-champion.com/index.php?topic=26499.0

Second is the spot in dragonblight, i saw a video for 10,000 exp a minute, the mobs in dragonblight spawn every 90 seconds and they are only melee so you don't have to be worried if you mass farm them like a frost mage.
http://images1.wikia.nocookie.net/wo...agonblight.jpg
The exact spot is that Galakrond's rest. there is a u shape bones of some dragon thing, above the pit

third check out this video:
http://www.warcraftmovies.com/movieview.php?id=95111