As a recent Mac-> Windows switcher for work, my productivity has nosedived partially for keybinding confusion. For instance, I instinctively reach for Option+Arrow keys to jump the cursor over words, which mapped onto the Windows keyboard is Windows->Arrow, which moves the whole window around the desktop into predefined positions. Cool feature, but my muscle memory for the other thing means I'm always screwing up window position (and never thinking to use it on purpose).
I've lost count of how many interfaces I've had to fenangle to get a job done. For 20 odd years I rocked Gentoo as my daily driver but my lap can't take the heat any more. Wifey gets Arch and I've settled on Ubuntu for a simple life.
Embarrassingly enough, I had to get a "child" to explain to me how to get a wine dispenser to work, recently 8)
Here's to hoping they don't turn into Microsoft one day.