Get an LTE phone and see. It's really amazing how fast it is. You'll burn through it like nothing.
First, just want to clarify that I wasn't directing my comment directly at you--just realized my reply looks that why and no offense intended.
I have a new iPad with LTE and yes, download/upload speeds are awesomely fast. My point was though that a fixed piece of data's size doesn't change depending on the speed of your internet connection. If a webpage is 1 MB, it's always 1 MB and the being able to download it faster doesn't change the fact that you will have just downloaded 1 MB. Checking my email will download the same amount of data, viewing a webpage, etc.
The only reason a person will go through more data is because they do more that requires a data connection. If you do EXACTLY the same things over 3G vs. LTE, your data usage will not go up by much (maybe a higher quality stream if you don't limit it, etc). If you decided to stream MORE or browse the web MORE because LTE speeds download pages faster and you elect to use that extra time to go to additional websites, that's on you as a user, not LTE.