It's a good article, but it is hardly the case that we went from DOS prompts to Windows 95 which would appear to be the case if you had no prior knowledge of early PC OS history. Windows 95 replaced the earlier Windows, Windows 2.x, and Windows 3.x which had in fact replaced DOS. Windows 3.1 was in wide use from 1990 until the introduction of Windows 95.
I used Win2.x and 3.1 (and 3.11 WfW) extensively, and switched into Win95 sometime in early 1996. But to be sure, I was still using DOS for a lot tasks, so I only invoked the "WIN" command when needed. OTOH, most of the DOS world was switching over into Windows as fast as they could by about 1990.
Yes. The big jump was 3.1.
My F500 employer was a MS beta. It wasn't until some time in 1997 that they considered Win95 to be secure enough for use. We were issued Windows 3.11. I was running a global project with 3.11 and the IS group was testing Windows 98.