I wouldn't mind the goo piles themselves if they actually looked like a pile of melted flesh and bone and not a giant booger.
That said, I think the ash piles are okay, if only because I don't think the engine would handle the body turning into ash, blowing away, and generating five or six items on top of each other and letting physics take over. They should, however, disappear after three or four days, whenever merchants and dungeons 'reset'.