The showers at the laundromat/showers/restaurant across from Roadrunner Market in QZT are just showers. Toilets and sinks are in a separate room. The shower rooms are kind of small, so it can be a challenge keeping your stuff dry. They were $6 the last time I was there.
I've never been in the showers at the Pilot because there was always a long wait whenever I stopped in.
The showers at Love's ($11) aren't fancy, but they're roomy, the water is plenty hot and the pressure is superb. Toilet, sink, mirror, fan, a place to sit. If there's a wait, there are restaurant booths where you can sit while you wait instead of wandering the aisles. The towels are a little small and thin.
There are 15 showers at the Flying J in Ehrenberg ($12), so there's rarely a wait. When there is, there's a driver lounge you can wait in. The shower rooms are modern and roomy. Toilet/sink/mirror/fan. The water pressure is good and the towels are larger than the other places and a decent thickness. The keypads on the doors can be stubborn.
I've never asked about the showers at the market/laundromat/resort in Ehrenberg.
I use pay showers about once a week, maybe twice if I want to splurge, then do sponge baths the rest of the time.