2G, 3G and 4G mobile networks

The thing is even though the 4G speeds are so much faster then 3G I don’t see how they are really much more useful.
Unless there is something I’m not getting about it, the pricing plans are barely any better as far as GB/month goes.
What about this am I missing?
It seems like the best thing that extra speed does is get you over the limit faster.

And it’s not that I’m trying to be a data hog. If the internet was all plain text I wouldn’t be reading more then a few MB per month. But websites expect everyone to be on broadband so they have become obese in extra code, scripts, images and flash. And then they want you to put everything on the cloud so you can download the same things repeatedly.

There are some things that are impractical on 3G, like video chatting, but 4G is hamstrung if you’re still watching how many MB it uses. Volume hasn’t kept up with speed as far as I can see.