I ran into this issue this summer. I was riding with a new friend who grew up in England, and had been in the states maybe 10 years.
We had to do a U turn at some point, and he was a bit slow and uncertain while making the turn. He commented that he had spent decades making U turns in the opposite direction (because England drives on the left), and hadn't gotten comfortable with the U turns here.
I haven't tried making any U turns of the English type, but I can see that it might be rather awkward. It seems very likely that we are better at the maneuvers that we make frequently, and would tend to prefer them, thus reinforcing that preference.
Steve in Peoria