I regularly group with a necro, and he does it at least a few times a night. Of course how much is for DPS, and how much is for freaking people out, I don't even know.
Then again this is the same necro who has hotkeyed "Add NAMED" when he does use Wake the Dead. So, I do lean towards the idea that he likes to make sure we are all awake more then anything else.
And as Dot noted, the named or boss mobs seem to have the greatest likelihood of being resurrected.