For the first time in YEARS, I am running the latest OS on my main work machine

[Onamuji]

I'm not into using full-screen apps, but I do move a lot of app windows to alternate desktops. A two-finger tap on a Magic Mouse isn't hard to get used to, but MC really shines with a Magic Trackpad. Nailing the reflexes to multi-finger-swipe or control+arrow or command+tab may take some time.