Yes, the Mellish scene is almost unbearable. As I mentioned elsewhere in the comments, it was actually toned down slightly by Spielberg, as his projectionist said he felt it was too painful to watch. I dread to think what the original cut was like, but I trust Spielberg's judgement in making the reductions he felt were needed in what is overall an exceptionally brutal film. Another scene involving Miller et al coming across burnt corpses in destroyed tanks was likewise considered too horrible, and was left on the cutting room floor.