Game of cards anyone? No deal!

Ok this is more of a rant than anything else. WHY oh why does everybody in London these days think it is acceptable to pay in a pub with a credit card? Or in a sweetie shop for that? I was in my local convenience store the other day when the girl in front of me passed over a credit card to buy a Mars bar! Honest!
But in a pub of all places it is the world's worst thing. For a start it takes five times longer to pay by card. First you have to say you want to pay, then they have to tot it up on the cash register because even if you've only had two pints and they're the same price the average staff behind the bar these days can't do 2 plus 2 in their heads, and even if they could they wouldn't be allowed to for fear they'd get the change wrong. Then you hand over your card, except you don't because you're not supposed to, in case they go behind the bar, make an impression and the next thing you know your card's being used to buy a Porsche in Beijing or watch porn movies in Kiev. So you wave it at them, and they go and fetch 'the machine', except they don't straight away because somebody else is using it for some other dork paying with a card. When they finally bring it back to you, they have to check how much to enter, you have to check it's right - and you should! - and then enter your pin (and if you've forgotten it, you deserve the lash), and then you hand it back and then the bar staff tear off the bit of paper and give it back to you with your card, and then you faff about for 30 seconds putting it back into your handbag/wallet whatever before finally lifting your drink and leaving the bar. BY WHICH TIME THE BLOKE IN THE QUEUE BEHIND HAS DIED OF THIRST.
There's this new system, called c.a.s.h - all you have to do is take your card to a hole in the wall (honest, it's hard to believe but most banks and even some shops have them) and punch in the number and they give lots of pieces of paper which the people at the bar can take straight away, and hand you some more bits of paper, or sometimes funnily little metal things called coins. Done. Sorted. Next please? It'll never catch on.