Found some fast respawning mobs in outland Sam, although it would be stupid to grind those instead of quests, i'll still give you the info : Gor'gaz outpost - Coords 45, 74 in hellfire peninsula. Mobs are 62-63. They are all mellee mobs it seems (at least 90%)
There were 2 of us (elem shaman 61 + feral druid 63) killing them for a quest (needing 20) and the mobs were respawning on us as we were killing them.

If you're still in your EQ mindset when you reach outlands, have a go at those.