It's funny. I actually discovered B/X through indie roleplaying games. Vincent Baker, the creator of Apocalypse World always talks about how well designed a game B/X was and how much he loves playing it, so I got but did not end up playing it for a couple years. I saw a video where John Harper, creator of Blades in Dark, raved over Stars Without Number, a space faring retro clone based on a combination of B/X and Traveler. We played a short game and ended up loving it, and then tried Moldvay and loved that too.