I don't use a smartphone because I just prefer to mostly be disconnected unless I'm explicitly at my laptop and secondly, I really have
actual use for the GSM phone, text messaging, calendar, and the alarm clock features.
My previous phone lasted almost five years. I was given a smartphone from work but it was full of "nice to have" things that I felt didn't matter in the end. And it consumed battery like a proverbial sponge. Now I have a Samsung E2370 Xcover which gives me a month of battery life. It has lots of features I probably haven't even touched yet because I haven't actually needed any of them.
I work for a company that develops smartphone platforms themselves and I find the mobile architecture quite interesting but I just don't want to use one myself.