To me, it was the astounding amount of interactivity between the community.
At first I thought this was temporarily caused by the whole migration from the R site. But, just out of curiosity, I signed up to Mastodon and have enjoyed myself just as much as here.
Most of the Lemmy post's / Mastodon toots have almost as much or more comments / boosts than upvotes or favorites. It feels so organic and makes me realize how much these huge companies employ technics to pretty much force to interact the way they see fit.
It reminds me of that good old saying "you are not immune to propaganda", well I guess neither I nor anyone is immune to psychological tricks either.
P.S. I also love the fact that since there isn't pretty much any money involved, most opinions and interactions are genuine. Like, who is gonna pay this dude to advertise a book through BookWyrm? That increases immensely the odds that said person is being honest with their opinion of that book. It's amazing.
I like the new location, due to the principle of federation itself. It's interesting to see how theaet many smaller communities will evolve, especially those of identical interests on different instances. There's an inherent messiness to the situation as we're mostly humans, so all the "baggage" I wish would stay on Reddit is someone else's entire enjoyment here...
I've also been surprised how many people are eagerly becoming moderators -- there are many communities I'd like to see, but am not convinced I could even moderate effectively, so it's impressive.
That said, I worry some of the excitement is due to novelty and self-convincing, like when people say "This is fun, right?" But maybe I'm just a bit too skeptical. Regardless, I'm enjoying the ride thusfar, and love seeing people's effort on instances, communities, apps be celebrated. It helps convince me that humans do enjoy cooperative success.
That's basically the same as on reddit, everything there also just got started by people wanting to see a topic discussed, I wouldn't worry too much, because at least in my experience, as the sub/magazine grows usually you find people that you trust that you can deputize into helping you moderate :)