I have never sent a text message, and I had the texts blocked because it was costing me money to receive them.
Everyone I have seen personally use his smart phones uses them for trivial reasons. I'm not saying that they cannot be worthwhile to some people, but my observation has been that they are used as toys.
My cell phone service costs about a dollar a day. If I had a job which required me to spend $100 per month on a smartphone, I wouldn't object. But without the specific need, count me out.