There doesn't seem to be anything about those features that makes them require a GUI.

e.g. I'm using ZSH specifically for it's command line autocomplete stuff. Emacs has helm for context narrowing and really good support for context menus. Vim will let you collapse/expand blocks of text including in XML using a mouse in a terminal window.

For spelling errors Vim will give you an straight red underline in the terminal and squiggly underline in its "GUI" versions. I assume that Emacs is the same.

I'm not suggesting you leave VS by the way. I'm just saying that your GUI only examples aren't GUI only.