Sure, I started using (emacs) org-mode about a decade ago after deciding I wanted to get my notes out of Evernote. Obviously I wanted to avoid migrating again in the future, I wanted something as close as possible to plain text that wasn't in a SaaS.
org-mode happened to tick all the boxes while allowing me to:
* make links to lines from e-books I can click and go straight there
* refer to part of an email
* todo and agenda
* export in a easily to many formats to share with my coworkers or friends
* have some basic spreadsheet functionality (I don't really have need for an office suite)
* inline source code I can eval like a REPL, etc etc.
I probably could have used a handful of tools to get what I wanted, but org-mode offered all that and more. I expect I'll probably use it the rest of my life.
as for this particular project? I'm not a vim user, but it's nice to know that should I decide become one, I've got options.