I have exactly the same experience and I am baffled how people get value from Twitter. I keep creating an account, going in, getting baffled, then leaving.
Why are so many smart and insightful people on Twitter? Because it's easier than blogging or microblogging? I see links to their interesting threads referenced on Reddit or HN and I follow those links, but I can't bring myself to care enough about Twitter (or Nitter) to actively follow anyone.
I guess if something is valuable enough on Twitter I'll hear about it elsewhere. Not sure if that approach holds up.
I'm looking forward to whatever replaces Twitter. I've been waiting for that thing for about a decade.