Does he have any use?
Bullhead has in my opinion only been useful for guild boss and battle royale. And that's when he's used as hero aid. Furtheron, I haven't really seen him being used by higher levels unless he had already been fully specced in by the player.
It's a vague answer, but just to be clear, I am nowhere near the spenders top, but I am not bad either. So it's somewhere in between for the average long-playing non-p2p player.
Hope this helps!