You can use a VIM plugin for many IDEs, including IntelliJ.
The only inertia vim adds to my workflow is escaping into command mode. I have a 'jk' shortcut combo rather than escape, but if I'm hammering away I often mistime it and need to backspace out my jjkk or whatever.
Good Vim input plugins can make IDEs more pleasant and efficient for users who prefer vim, neovim, vi, elvis, etc.