I once read a series of jokes similar in style to Jeff Foxworthy's, "You know you're a redneck if...", but these all started, "You know you're a white person if..." The punchline in most of them implied that white people are too anal and uptight. When I got to the one about, "You know you're a white person if you get out of the shower to pee", my reaction was, "yeah, I do that, and now that I think about it, *why*??"
As you say, a paradigm shift. It's the same damned plumbing, and at least in the shower any risk of splashback is immediately washed clean. Plus it saves dripping water all over the floor. But unlike George, it's not something one should do in a communal shower.
I admit that I only do it in my shower (and hotel rooms - I travel a lot).