This is a popular misconception but it untrue.
Just because the speed is 60meg instead of 30meg doesn't mean you will do anything differently so you will use exactly the same amount of data regardless of speed.
Lightspeed is correct, nobody needs more than 30 meg at the moment since allowances don't allow for general land-line broadband replacement.
I'm a speed freak and total techie nerd so I don't need it, I WANT it!! Very sad!!
Where headline speeds are important is in general cell capacity. The faster the speeds the more people can connect and get things done quicker.
Internet use is generally bursty. A 5Mhz LTE cell can handle 200 simultaneous active users (actually transferring data) as full speed. There can be a lot more inactive users. The quicker the data packets can be delivered to each active handset, the more total (active and inactive) users the cell can handle without everything grinding to a halt.
10Mhz can do 400 users and 20Mhz 800 users, all at full speed..ish..
So in theory a 20Mgz EE cell (one sector on a three sectored mast) running at full speed (double) can accommodate a lot more active and inactive users than the same 20Mhz BT cell running at single speed.
Of course all these EE and BT users will be on the same cell so it's a way that EE can prioritise it's own users.
Jabba or Lucan will come along now and tell me that's crap but I'll just blame it on the Chardonnay!! Hahaha