I don't really use it either. I just checked my usage and I've sent 5 texts this billing month (which resets in a couple of days). On the other hand, I know of people that send thousands! 😱
Edit: I should clarify. If you're talking about SMS, then yeah, 5 this month. If on the other hand you mean any sort of textual message (MSN, Google Talk, etc) then I'd probably go through thousands in a month. In this regard I use the phone as a replacement for messaging on my PC when I'm out or at work (although at work I use a keyboard so that I don't have to peck at the screen all day!)