I've been on I3 with nixOS (and emacs as my go to editor) for a few years now, and it's a dream. I can carry my configurations between machines with almost no setup. Every computer I use is the same.

I find Windows and macOS painful to use. Constantly hunting around for applications I have open, that requires me to remove my fingers from my keyboard and play around with my mouse. I barely bother to use tabs for anything (terminal or browser), just switch to another workspace and pop up another instance of FireFox or a terminal.

TWM do ruin you though. Once you're comfortable in them, you'll never want to go back and so using somebody else's computer just feels alien.