After the level 61 mobs and then the mobs in Nagrand, AOE is not that easy. At least the spots are very limited. Blades edge have a few spots where you can kill 3-4 mobs at a time, but respawns are so slow that it is not worth the time. Some mobs introduced for AOE only gives 1/4 the exp of normal mobs.
I did found that questing gives the best exp/hour from 62-80, but that is just me. I however did some aoe grinding in nagrand on the birds there, they have no stun/knockback.