Not having to carry cash. No pound coins sagging your pockets down. To and from the bar in record time. Going out with nothing more than a card in your pocket and knowing you can pretty much pay for anything you want with it.
Contactless is ace.
I have one of them things you stick to the back of your phone and can put a card in. That means I can forget my wallet and I'm still good to go. wd technology imo