East Campus - 10 floors, 400 students, 6 washers, 2 dryers. You do the math. The trick was always finding a machine that was free. The second trick was finding enough quarters to dry the clothes you'd just washed. To make it more interesting, the laundry room was in the basement. But the TV was upstairs in the lounge, so it was possible to take in an afternoon of NFL football or Star Trek. And then at 3 in the morning one of the washers and dryers would free up, so you could do your laundry.
When I finally moved out of the dorm, I found out things were no better at the public coin-ops. But now I own a washer and dryer of my own...which my wife is willing to let me wash clothes in, whenever I please.