But I'm also seeing authors, actors, journalists, doctors, and scientists I follow make their way over, as well as a few novelty accounts.
Sure, many of them are dual-posting. But I still see them interacting directly on Mastodon and not just mirroring their Twitter posts on it.
I didn't expect this, but I'm finding it very easy not to use Twitter most of the time. The main exception is friends and family messaging various tweets to each other to share news or laugh about something. So I still have an account, it's still useful, but I'm not scrolling it casually anymore.