Just counting my lucky stars that we don't have to do 'lay on the engine' repairs on a 6.4 yet. I was climbing out of the engine compartment on 08 SD, and slipped, caught my head on the grille, busted the grille, sliced my head open, then bruised my tailbone/ass/back when i hit the floor.
I too, sometimes find the damn thing too high and find myself ducking around shit that's in the road.
you can sort of see our sweet ass topside creeper in this pic. I love how on a 4x4, i get my big ass up on that thing, and the thing is into the rad/stator/shroud, big time.