OK, migrating instances works!
... except I don't think the list of people I follow has crossed over.
Follow
In general there's a bit of clunkiness around here. E.g. I see a toot I like, click on the account's name, click the follow button, then learn that oops I can't follow someone on the website of their instance, I have to do that on my instance's website.
that said, it's the sort of thing I could get over in return for a good community.