I'm so glad you mentioned this, I find that when I have to switch back and forth between mac and windows, I struggle with muscle memory switching from ctrl to cmd, and on mac I always struggled to figure out which window is my active window.

Such tiny things, but it's one of the things that has kept me on windows (even though I used a mac most of the time for the past two years).

Some of my co-workers switch between mac, windows & linux without skipping a beat.