I do as well.

I do. It's almost the size of a standard household shower stall--maybe a couple inches smaller in each dimension, but quite roomy. The shower in the bedroom, on the other hand, is small enough that turned sideways, my shoulders are almost touching the walls, and turned the other way (perpendicular to the toilet seat), I have to slightly lean over the toilet (just an inch or two, but it's an uncomfortable position to maintain for a while due to the curvature of the spine) in order to avoid touching the door.

I thought this way until I actually traveled in a bedroom for five days last month. It's convenient, but it's not comfortable. The shared shower is almost like showering at home (plus it's on the lower level, which means a small bit less swinging and swaying). Then again, shared showers have never bothered me (as long as they're private--I don't like shared ones where you have to display your manhood for the rest of your brethren to see); I stay in hostels and have no qualms about showering in them (I don't even bother with flip-flops).

Plus, the idea of covering the toilet area with water just feels wrong to me. IMHO, you have to decide whether you want to use the in-room bathroom as a toilet or as a shower--you can't really have both. At least I don't find sitting down on a wet toilet seat (and it gets wet, even with the seat cover closed) comfortable.

This is actually the biggest reason I don't like using the in-room shower when traveling with someone you're not super close with. It's not an issue for spouses or perhaps siblings, but when traveling with friends, it can be an issue if you like privacy. The bathroom stall is so small and gets covered in water, so you can't bring clothes in the bathroom with you. This means you need to strip before entering, take the shower, and get dressed after exiting. The area outside the bathroom stall to stand and change can also be tight if the lower bunk has not been put up.