Among college students, flip-flops are commonly used while taking a shower. This may not make sense to those who have never shared a shower with (at best) seven and (at worst) close to twenty other people, but showering barefoot in such circumstances day in and day out - not once a week at the pool - is a very good way to get athlete's foot and other foot problems. Once chooses flip-flops because, in addition to drying next to instantly, they can be easily stepped out of to lift, lather, scrub and rinse one foot, and then stepped back into without touching the floor of the shower.
Personally, I didn't think to use flip-flops last year, but do this year and am frankly amazed that I didn't have foot problems from the past negligence.
You know you've been a college student too long when it feels odd to shower without wearing flip-flops.