I’ve used various layouts of non-US keyboards over time since I’ve lived and worked in various countries in Europe and whilst you do start by looking down to find stuff and for a while will at times unthinkingly choose the “old” position for a symbol when touch typing, you just get used to the new layout in a month or two, even if touch typing - your brain just starts directing your fingers to the new positions.

That said, for seldom used symbols you still have to look down and check on which key that symbol is (it’s generally printed on the key), I suppose because you don’t really exercise those enough for your brain to reliably start sending your fingers to the new position without looking.

(So given the languages I usually program with, for stuff like semicollon and open and close brackets and parentesis the brain quickly adjusts but stuff like the dollar sign I still have to look down and check, which is really noticeable if for some reason I have to shell scripting or similar)

Things like letters and numbers don’t change position so that’s not a problem.

Once you’ve become accustomed to a new layout, switching keyboards between those layouts is a bit like switching the side of the road you’re driving (say, between the UK and Continental Europe) - you get a couple of hours of extra memntal tension and having to think things a bit more at first and after that you’ve fully readjusted.