The added benefit for me are, staying in the terminal where I do more than just edit, normal mode makes file navigation and text manipulation an extension of thinking, fast file switching, cross platform consistency, and a low maintenance burden (though the initial learning curve/setup is steep).

I work on Python apps all day and am constantly running she'll commands, interacting with git, starting / stopping services. Along with tmux, I can switch projects incredibly fast without having to wait for an IDE to load.

If you don't interact with text most of the day, I am not sure Vim is worth the curve.