one thing bugs me the most, as a linux user, is that copy and paste by mouse middle button, now I have to use mouse to select it, then cmd+v to paste it, what a hassle.
of course I changed that scroll down instead of scroll up thing, I don't want to move up the bar to move down the page, that's just odd.
click to close windows does not really close the apps also bothers me.
Apple is such a closed company nowadays, worse than Microsoft from the past in fact, made me hard to love it, thus those nitpicks becomes issues for me.