Some people write long form tweets or threads, and they can take hours to research/compose etc. Not as long as blogs, but still a decent amount of work. I personally prefer to follow people like that.
I've been also trying to find these people and follow them on tweeter, but it's hard to find. Mostly either don't tweet much, or tweet a lot of noise!
If you can't find a lot of good people to follow, it just means you end up wasting less time in Twitter. It's a win-win really.