I was a big player of MUDs back in the 90s. I probably spent way too many hours staring at green text (when I should have been studying), but I wouldn't trade those hours for anything. Some of my best computing memories of that era are from playing various MUDs, and even 20+ years later I still keep up with some of the friends I met in the games.
Many of the MUDs I played on are sadly long gone, but a few are still around. I still have characters on a couple of them that I connect to every so often, like maybe once a year or so.
The connected player base is just a fraction of what it once was. Which always struck me as odd, seeing as how there are massively more people using the Internet now than there were in the 90s. Even accounting for cultural changes and technology moving on, it always struck me as there should be enough new people interested in the old ways to keep the population level, but alas that doesn't seem to be the case.
I'll go walking around the old worlds, remembering the epic battles involving dozens of players and hundreds of NPCs. These days, most spaces are almost completely abandoned. If you've ever seen the music video for Sting's song Fields of Gold [0], it captures the mood of walking around the old rooms perfectly. It seems like just yesterday we were all having a grand time RPing, but everyone's gone now.
I stopped playing a lot in the late 90s/early 2000s when I left for college. I would still connect occasionally, but I just didn't have the time to devote to it like I did when I was a teenager. In that time, Warcraft and Second Life sucked most of the people I played with away, and I could just never get into either. They're kind of overload for me, and, frankly, just not very interesting. For some reason, my brain just works best with the simple text that MUDs provided.
Walking around the old worlds is sad, true. Nostalgic. But also some happiness. I'm glad I got to be part of that era, and glad for the friendships I made.
[0] https://www.youtube.com/watch?v=KLVq0IAzh1A