Not usually, but every once in a while if I want a good relaxing soak sometimes I'll just kneel down in there and turn the heat up a bit and just soak it in. It's usually only ever for a minute or so.
The tubs at out place are tiny, though. Narrow, short and very, very shallow. Surprisingly shallow. I actually have to cut like 6 inches off a shower curtain when I put in a new one. It's weird, especially with 10-foot ceilings in the house. And I'm not little, so a bath is not a possibility there.
I've only ever sat in the shower when I was extremely ill and too weak to stand. It was uncomfortable because my shower is built for people about 6 or 7 inches shorter and much thinner than me.
Its also uncomfortable to stand in but I digress.
Only when I'm not feeling well. It's because I can't afford to sit in the shower for 20 minutes at a time lest my water bill rise (broke student troubles) and my roommates get pissed for hogging the bathroom in the morning.
Considering my shower and bathtub are the same thing (common in North America) I do it with relative frequency. I'm somewhat depressed and have a caffeine dependency so mornings are pretty difficult for me. So yeah, sometimes I do, sometimes I don't.
Tried it once, never again. Not only is the water mostly cold by the time it reaches down, I don't like the feeling of it when it sprays more than I want it to spray (might be due to the water's warmth, though).
I will only squat in the shower if I am very tired, or I'm very depressed, or I am incredibly dizzy and would likely fall over if I tried to stand up straight. Other then that I would view it a a quirk more then anything else.
Huh. Surprising how many people posting have stall showers. The only time I've ever lived in a place with a shower not situated over a bathtub, it was in a barracks, in the Army.
So yeah, shower to bath and vice-versa is all the same to me... though I usually lay down, as opposed to sitting or squatting.
...also... yes, I waste a lot of water, but I'm not connected to city water. I have a tapped spring on my property that flows 24/7 into a stream and provides far more than I could ever use. It's also only one of three on my property.
Additionally, my gray water output goes into a gravel filter, so wasting might not be the right word for my water use.