Probably most of the people who used them a lot at the time would be 55–70-year-old men in the US today. https://www.ssa.gov/oact/STATS/table4c6.html suggests that 88% of US men who would be 55 if they were still alive are in fact still alive, and 72% of US men who would be 70 today if they were still alive are in fact still alive.

So probably three-quarters of the people who remembered them in, say, 01990, still remember them. You remember all those guys, and the occasional gal, you saw at computer stores and user group meetings at the time? Most of them are still alive, and most of them still remember them. They're just harder to find because places like HN have filled up with MBAs.

(I remember ]CATALOG but not *3D0G.)