I left prior to the blackouts (right when kbin was getting off the ground) and haven't looked back.
Back a couple years ago when Reddit was giving out those "year in review" cards you could post images of in response to Spotify doing it (I think Spotify's was something like what songs you listened to most or what genre or something, so they did ones with what subreddits you frequented most, where most of your upvotes came from, etc) I was awarded as someone in the top 3% of active users/contributors to the site - so I assume that means I didn't more time there than the average person (though I know that probably includes all the throwaway accounts and people that made accounts and never came back), so the loss of my contributions have probably taken a toll on the communities I've frequented.
And I certainly miss the niche communities that I loved that haven't made their way here, but I'm finding new things to fill the void. This place has things that are different - it doesn't have to be exactly the same. And kbin/Lemmy is certainly coming up with it's own "had to be there" inside jokes that are making this the place to be.