I started using OS X about 6 months ago. Even though I am totally fine using the thumb now for pressing the command key, I do always feel as if I was moving an

I started using OS X about 6 months ago. Even though I am totally fine using the thumb now for pressing the command key, I do always feel as if I was moving an octave down on a piano keyboard (I used to learn when I was a kid). Depending on where the control is on your keyboard (Windows vendors keep swapping FN and CTRL unfortunately, and rebinding might not be easy), I think the position of the hand is more natural - on the other hand, you might strain your pinky when pressing CTRL (or SHIFT) for long time and I haven't noticed that with using my thumb yet (and I doubt it will happen, given it is a much stronger finger).