With a very fast attack speed weapon and +15% attack speed on rings, amulet and gloves, it is fun to machine-gun with a Witch Doctor though . Check out the beginning of this vid as I mow down a Treasure Goblin.

Respendent Chest Run Inferno - YouTube

(this is act 3 inferno Respendent Chest run, great place to farm, I got the weapon I am using in the video there earlier, after running it for an hour)