I think it's still pretty common if you play a lot of PC games, but it's likely much less so. There seem to be less and less games giving you out-of-the-box developer console access which over time will likely cause new video game players to not know about them as much.
Interestingly noclip (as in Danny O’Dwyer) have their own video game archiving project going on, where they’re preserving and uploading old clips to https://archive.org/details/noclip?tab=collection
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