I wouldn't call that snowflakey - I'd call that courtesy! I don't want to trip over someone's clothes on the floor or have to avoid looking in the mirror to avoid seeing anything more than they'd display outside the bathroom. If that means having to wait a few extra seconds, well, them's the breaks, and perhaps the office needs more bathroom facilities or a dedicated locker/changing room. I'm certainly not interested in showing my extra skin to anyone passing by outside when the next person opens the door.