Whenever I end up on another computer without my environment setup and end up in nano because it is the default, it always takes me a while. There is the cheat sheet at the bottom but as soon as the text appears I'll start manipulating it using vim keybindings and delete things and whatever else randomly. I always assume my fingers were not on the homerow correctly or something first. It is very disorienting.

So I imagine it is far worse for someone who ends up in Vim the same way.