I'm with you guys. I start the week off with presses because they are the lightest. And it's natural to hit the upper back with shoulders. Maybe some mid section too, to help stand up straight. This stuff helps my posture, and sets me up for the rest of the week. Plus, every joker in the gym benches Monday, so I can avoid that mess.
I deadlift/do "back" Friday, because it's sort of my favorite, so I'll never be too tired.
-When I was younger, I loved the full body, H/L/M setup. If I were 19, I'd probably do it this way.
-When I was busted up and out of shape, I did Pull/Push/Legs for awhile. Then I added a second, super half assed Push day. Basically, whatever limited work I could handle. It was natural to turn this into "shoulder day" after awhile.