Earlier quoted context omitted.
How non-technical are we talking here, though?
The layperson used to use WordPerfect 5, a non-WYSIWYG word processor which required typing 'codes' using modified function keys to change styles. It came with keyboard templates so you could remember which key did what. IRC and USENET are simpler than that.
"Wordperfect" as a Google Ngram term peaks in the early 1990s:
https://books.google.com/ngrams/graph?content=Wordperfect&ca...
Microsoft Windows 3.1 was released in 1992, selling "over a million copies" in the first two months of the year. That would an annual sales track of ~6 million or so.
In 1980 there were 2 million computers in the US, doubling every 2 years. By 2000, there were 168 million computers, only 6 doublings rather than the 10 the 1980 estimate would have provided. That suggests about 16 million users as of 1990, possibly 24-32 million by 1992.
As of 1995, total worldwide Internet usage (then largely in the US, though also Europe) was 16 millions. As of 2019 it's 4.5 billions.
https://www.internetworldstats.com/emarketing.htm
That would have been the more educated, wealier, and generally professional class of users, for the most part. For better or worse, computer use has democratised tremendously. The capabilities of the typical user have all but certainly fallen correspondingly.