This is my first post. I drifted away over the years, but started out on a Symbolics 3670. It was a revelation when I discovered this (along with the first generation Sun machines to run it):
I have that spiral-bound GNU Emacs Manual (with the yellow cover), and it was a revelation also! I was working at a startup back in the early 1990s for a year or so when the lead developers there decided to ditch vi for Emacs. We then spent a month or so learning it and then I spent the remainder of my time there (2-3 years) using it for C programming but also News, mail and even basic shell stuff. I'm back to vi now (via Vim) and have been sucked into "modern tools" like Eclipse and Visual Studio Code, but some Emacs still exists in my muscle memory.