What do you mean spend mental energy on keybindings? Sure it will take you a couple times to do them to remenber them but after that you will just know them without having to think about them.

I don't know if it took me more than a couple hours to learn enough keybindings to be more productive than in vscode, and later on I just learned more as I need them and am now able to use them without thinking about it.

I used to spend more time searching for the button to click with a mouse and remembering in what menu it was than it took me to learn and use vim keybindings.

But this is all diff from person to person.