Learning the Dvorak keyboard layout.
It seemed worth it at the time when I was playing a lot of monkeytype and I still love typing with it. But I made the full switch and forgot how to touch type with qwerty. So now I have to switch layout every time I use hotkeys and switch back to type. Switching is fast but an extra step.
I decided to switch because I think it's a superior layout but honestly it's not even that worth it. You will not gain speed, just more comfortable and satisfying.
Yes it is inconvenient asf when it's not your own setup. I use window for work and it's a pain in the ass to install. And the computers (shared) reset to default settings every 2 months or so. The dll-files still remain after this so I have to remove them manually before reinstalling. On Linux this would not be a problem