If you just use it for that, you're missing out on a lot.
Yes, technically speaking, it's a glorified RSS feed. But due to the presentation and the way people use it, it's more than that.
Check out, for example, the Dell Outlet. http://twitter.com/DellOutlet Dell made $6.5 million from this Twitter account. Why? Because they actually engage in discussions with their customers. It's an incredibly powerful way to reach people that are buying your stuff. Part of the reason I'm still a Verizon customer is because I got frustrated with their service, complained on Twitter, and within 15 minutes, I got an @reply and then a dm from a rep, who got actual real CSRs to call me, and my stuff got fixed.