@jonathankoren yeah, I used C64 GEOS for all my school work for at least a couple of years. Before that I had SpeedScript, the first version of which my dad and I typed in from a magazine. I seem to recall I used some other word processor on C128, but I don't remember what. Then it was Final Writer on Amiga.
But, GEOS has a certain nostalgic magic about it. I've tinkered with it more recently, and it is dog slow on a C64 with a real disk drive and no RAM expansion, I don't know how I endured.