I love Twitter! I follow several news stations (local, a few cities I visit frequently and national news) and I hear about breaking news far quicker than I would otherwise. Often I hear news on Twitter and then several hours later finally hear it on television or other websites.
I also follow a few of my favorite authors. One of them tweeted from the Hugo awards ceremony last night to let fans know that his book had just won. He also tweets about upcoming signings or speaking engagements. A couple of actors I like tweet frequently about new roles they've just gotten. Jon Favreau has been tweeting about the making of Iron Man 2.
I follow a couple of video game news sites and love getting their updates about game reviews and release dates. I follow a few game developers and people involved with Microsoft and they have all sorts of tweets about gaming and they sometimes give away games to their followers. They also ask their followers for feedback about different things and actually seem to appreciate getting info from everyone.
"Shamu" tweets cute pictures from Seaworld or animal trivia. He often gives away shirts or hats to people who answer trivia questions.
And I do follow some friends, as well. But most of them don't tweet things like "Eating a tuna sandwich." They tweet links to things they've found online that they thought were interesting, or other random things that they want to share. I tweet random holidays each day - today is "Lazy Day" and "National S'mores Day". We do sometimes tweet about our day as well, but that's not all that we do.
Twitter isn't for everyone, certainly. But it doesn't just consist of the minutia of everyone's day, which is what many people seem to think.