Admittedly I've only been in around ten or so different locker rooms in my life, but only one had any sort of reasonably private dressing areas, dividers between urinals, or individual shower stalls (it even had curtains!). The one in my high school was literally just a big open room with shower heads on one side, benches and a wall of lockers on another, and urinals and toilets right out there in the open--no stalls, doors, or anything. Like, if you had to shit, you'd just have to accept the fact that now every guy in your class had seen you shit (not surprisingly, nobody ever did).
I've never understood why they're built like this. Is the men's locker room just some kind of architectural gag? Like playing a song really perfectly and then totally fucking up the last few notes on purpose to make your music friend laugh? Do people actually like locker rooms to be that way? Why? I mean, I'm going to use it anyway because I have to, but I don't understand.