I know of one marina, 5-star reviews, great customer service, etc. But there's ONE shower stall. More like a large closet with a large opening, but no door and no curtain. It's in an even larger room with a tiled floor. At least that room has a door with a privacy lock. Also in that room is the only washer and dryer. You can't shower when someone's doing laundry, and vice-versa. Unless you know each other pretty well.
Then there are the marinas with pay showers, but un-metered water and electric included in the rates. Huh? I'll heat their water with their electric and take a long, hot shower on my boat, thank you.
I look at showering barefoot the same as going anywhere else barefoot, which I prefer if I can. Unless the shower is visibly dirty. Then again, I get up early, so I'm usually in the shower while it's still relatively clean.
What I don't like is a shower with no way to keep the water in the stall. It's hard to get dressed when your feet are wet. Even worse if all your clothes and towels get wet. It's no fun doing the one-footed dance, keeping my one dry foot on top of a shoe, or the other tricks we're forced to perform in a wet stall.
I was thinking a roll of butcher's brown waxed paper would work as a disposable dry floor covering, for those times the person before you didn't close the shower curtain properly.