Oh man. I'm embarrassed to say I've been using emacs for almost 40 years and it probably accounts for 80% of my screen time. I wonder how many people know emacs predates gnu-emacs? I remember being skeptical of open source until I saw what gnu emacs could do. Then I got slightly more skeptical when I looked at the code ;-)
Tell us more. What were you using before GNU?
is about pre-GNU Emacs, with history of Emacs going back to the mid-1970s.