OK, so it looks like a ton of people use their smartphone as a feature phone.. or coincidentally, a lot of those polled actually don't own a smartphone. But one thing not surprising is that people still don't know the differences in wimax, hspa+, and LTE. But god dammit, the iphone has been out since 2007 and people still don't realize it's not on T-Mobile.
I don't think it's that surprising. The whole "4G" push in the United States in terms of marketing isn't much more than a year old. When you combine that with standard two year phone contracts...voila!
It all depends on what you're doing. Video streaming (netflix, hulu plus, youtube) really benefit from 4G. General web browsing on mobile optimized websites do not. App/game downloads also benefit from 4G as well since they get bigger and bigger.
I download all my apps on wifi. I haven't tried streaming anything yet but Direct TV has that Sunday ticket thing that I might use.