Thirty-five years ago, I had a couple of slightly frustrating weeks sitting in front of a VT-200 serial terminal.
Over the subsequent three and a half decades, I've had an editor on virtually every computer system worthy of the name which Just Does What I Want It To. It's there for everything from one-liners to book-length files to editing multi-GB datasets or Web scrapings.
And I'm still learning features and concepts, though now around vim rather than the original BSD vi.
And no, vi isn't the only editor I've used with proficiency: DOS EDIT, EDLIN, KEDIT, WordPerfect 4.11, VMS EDT, VMS EVE, TSO/ISPF, Emacs, pico, nano, and more.
I quite honestly wish I could get back into emacs, but vim has a stronger pull and solves virtually all my problems. org-mode does have strong appeal, however.