I see what you're saying.
My husband and I got a pass for the Rainforest Room on our first
Disney cruise about 5 years ago. For us, the showers were so awkward because they are open. If you are wanting to try one and it's occupied, you have to find something else to do or stand there and wait for the occupant to be finished.
You totally have swimsuits on, but it is odd. We couldn't stop laughing at how serious some people were in there.
It's also weird bc we went into the sauna to sit for a bit, but there were other people in there as well. You either have to strike up a conversation with them, or sit quietly bc it's such close quarters.
The hot tub was small and a definite no-go for me bc of how busy the Rainforest Room was.
The tile loungers weren't bad (once one became available) bc we had robes on, but it's hard to enjoy yourself when others walk in looking for an empty lounger. Some people stayed on their loungers FOR-EVER and I thought that was rude. We ended up using the pass one day and only for about an hour total. Now we can say we tried it and it's not for us. The spa experience is best (for us) enjoyed privately.