4G isn’t yet an indispensable technology – and if you don’t really care about the speed your devices work at, or if you’re quite happy with the way they work, then it won’t make a blind bit of difference to you beyond the fact that at some point you’re going to have to get a new phone.
The benefits of 4G, though, certainly can’t be denied – it’s four time faster than 3G, which means you ought to be able to use your mobile device with the same agility that you use a home internet connection.