Yea I have, and that’s exactly why I created this. Finding them without this tool would have been really annoying. Here’s a screenshot of the top 12h rooms:

Right now they are pretty diverse. The two most active I recommend starting off in if you’re English speaking are #envs_lounge:matrix.org and #anime:matrix.org

This is the one I made https://matrix.to/#/#all-topics:matrix.org before I created the activity tracker and realized there were several others.