You forget the millions of M2M systems and business services running on these data networks. Busses, trains, etc. anyone? Those hotspots run off 3G and 4G services. There may be anything up to 800 passengers on any one train, with several hundred using wifi at the same time.
As for an end user - the benefit comes from high bandwidth applications you're not using 24/7. While you probably don't need the latest Angry Birds update at ultrafast speed, getting it done in 5 seconds instead of 50 is still nice when you've got 40 app updates to do at the same time.
Personally my heaviest usage of 4G so far was having to download a Windows service pack at a customer's home, who had no fixed-line broadband access. That was a good few hundred megabytes that'd have taken several hours without 4G. If I need to do a big download on the move, it's usually because I need to do it and can't get my work done until it's finished. Especially important when I have my next customer to get to in an hour and I don't have two hours to sit around waiting some download.
But they do say the biggest benefitters from 4G at the moment are business users not your average consumer, and I find that hard to disagree with.