Re: Any point?
I've found my 4G handsets to be quicker in connecting to a web page - sometimes near instantaneous. I do occasionally turn off all data to save battery if I'm in an area of poor signal, but it's an all data / no data toggle on my Android. I don't know if an iPhone will waste battery trying to grab a weak 4G signal if it has a good enough 3G signal available - though it seems a curious design choice if true.
In the future, 4G has the potential to save battery life once cells don't have to bother with 3G... it's something to do with handshakes and minimum packet size or something, IIRC.