I recently started a new job and opted for a mac thinking "it's a unixy system, so it'll be more like my home linux setup". I have some regrets. The forced scroll acceleration is particularly intolerable; I had to find LinearMouse to get rid of that.
Another infuriating weirdness is window focus. Alt(sorry, _command_)-tabbing to a window brings all windows of that application to the front, possibly obscuring other windows you have around. And if you switch virtual desktops to one with a fullscreen window while you have another window of that application open on another monitor, it won't focus the fullscreen one you just switched to but rather the other window.
Another infuriating weirdness is window focus. Alt(sorry, _command_)-tabbing to a window brings all windows of that application to the front, possibly obscuring other windows you have around. And if you switch virtual desktops to one with a fullscreen window while you have another window of that application open on another monitor, it won't focus the fullscreen one you just switched to but rather the other window.