I can relate to that. The wipers on my Nissan work opposite to the way they did on my Saturn. So for quite awhile when I wanted to switch from low-speed to high, I turned them off instead, or when I tried to switch them off, I'd switch them to high. Also, though the radio worked the same, it was positioned just different enough that I had to look at it instead of doing it by touch.
Luckily, the important parts of every car I've driven in were the same.