I do 100% of my software development in vim. I have syntax highlighting and some auto indentation but otherwise no autocomplete, no LLMs, no vim plugins for hopping between files.

I just… write code? If I need to remember what’s in another file, I open up that file in an adjacent iTerm pane, or pull up the docs for the library, etc etc. if I want to have the program run every time I save, I run a watchexec in an adjacent pane.