The programmers that prefer VIM (or Emacs) to more modern fully features graphical IDEs are basically the same as the writer who prefers an old DOS program.
It means that old software was more usable and reliable to the point that a lot of people is more productive with it than modern programs. It is a big fail of the modern way of realizing applications.
Text-based interfaces have always been way faster at what they do (anything non-graphical). You simply cannot beat the efficiency of a power user who knows all of the keyboard shortcuts for their favourite text editor. I don't think that's an indictment of the GUI, however. The GUI ushered in ubiquitous computing akin to the personal automobile. Text-based interfaces remain a powerful, highly specialized tool for those who have the time and the need to learn them.
I would argue that this doesn’t apply specifically to text editors. 95% of all text documents are paragraphs with headings and inline formatting. With styles and display codes, WordPerfect lived up to its name. You could get the document looking perfect, exactly the way you wanted it. WYSIWYG editors look nice and could get you started quickly, but anything more than a letter turned into a mishmash of styles and fonts and spacing. The now-infamous ribbon in Word lets you discover and apply all sorts of formatting, but what you really want are consistent paragraph styles. Word perfect guided you into using those styles because the UI was restricted in just the right way.
I've been using ST for 8-ish years and never use the mouse/trackpad/touchscreen/joystick/stylus/trackball/wheel.