Yep,
To keep the floor from getting wet:
In a ha room (at least the room we had) the shower is on a hose - which in some ways is really nice. And the shower is huge -- also in some ways really nice. So trick one is to make sure that the head doesn't point at the shower curtain. If it does point at the curtain, the water will run down the curtain, hit the ramp down, and flood the bathroom. (The shower curtain is set "inside" the ramp, so most of the water goes down the drain. But the curtain isn't anchored and does move, and there is a little ramp so the wheelchair can get into the shower, so water than ends up on the downside of the ramp does get all over the bathroom floor).
The second trick is to swipe some pool towels (for this purpose I feel justified, I'm not advocating swiping towels so you get out of paying for extra clean daily towels) and make sure to set a layer (it may take two) in front of the towel exit, for the water that does leak out. If you actually dismount the shower head from the wall and use that handy hose, you probably will get water on the floor if you don't have towels.
If anyone from Disney is purusing this thread - there should be someway to engineer the shower curtain to attach to the bottom of the shower inside the ramp to keep the floor from getting wet. It might not be too usuable for the mobility impared if they were staying in the room alone, but for those of us that can hook the shower curtain along the bottom, would keep the biggest hassle of a handicaped room (IMO, other than the lack of tub in a studio for the kids), from being such a problem.
I wouldn't choose a HA room over a non-HA room, but it really didn't seem to be to use the huge deal so many people make about it. It was our first trip as well - the room was clean and well decorated. And it being our first trip, I didn't even notice things like the missing kitchen bar that might have been a bigger deal on subsequent trips - our habits (put the kids at the kitchen bar for breakfast) hadn't been set yet.