I don't text. I don't IM except at work, and emails can wait till I get home. It is handy to have a web browser for when you absolutely must look up something on the go, but honestly that doesn't happen often enough to warrant a hefty data plan. Yeah, I don't have a data plan. I look for free WIFI if I need internet.
So what else is there? Reading books? I do read books on it (while on the go), but it's generally an unpleasant experience because the screen's so small that it renders everything at the subpixel (read: blurry) level and I spend all my time either squinting or doing zoom-in-and-pan.
Tablet? No, thanks. If I wanted to lug something big around, I'd take my laptop with me. It's far more versatile.
Games? Meh. I still haven't found any really compelling smartphone games. And really, if I wanted to play games, I'd just play them on my laptop or desktop, which have better specs and bigger screens and better input systems.
Camera? Well, I've taken some photos with it, but I don't use it often. I suppose it could come in handy for that one time when i REALLY need to take a picture.
The things I DO like are:
* note taking * voice recording * learning apps * Being able to transfer stuff onto and off the phone without too much hassle
Aside from that, there's not much I find compelling.