I don’t know when or why I learned vi, but once I used it for that short period of time I got used to it and it’s just muscle memory for me now. 99% of the dime I’m using x to delete text, yy (or #yy) and dd (or #dd) or p/P to copy/delete/paste lines, or :s/oldtext/newtext/g, or :wq or :x to write and quit. That’s like basically all I ever use VI for and it’s quick and easy to do. Once you know it, like anything, it’s quite a nice editor. Of course it can do a lot more than I typically use it for.
If you think it’s complicated, think about the first time you had to type sudo apt-get install firefox instead of googling Firefox and double clicking an executable.