I can confirm that this trick works (maybe better with lag issues, or lag generator). I've been able to make it real from the start of WOTLK (maybe it worked before, i don't know)
Currently, the "dead" status is applyed BEFORE porting you to the nearest Graveyard. Doing so, you are, for a really short time, In ghostly form on the top of your corpse.
As you may know, being a ghost running toward your body grants you the "Resurect" button on screen.
By Spamming, you answer the two questions here, Release corps, Resurect @ corpse. Sometimes the teleport don't occur at all, then you are alive again on the same spot
Hoping this will clarify for those having issues
(Sorry for my english, far from being my native)