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I think it depends on the situation. Perhaps in a true fast-food restaurant, like McDonald's, it might not be quicker. On Wednesday, I stopped at a Sheetz -- a chain of gas stations/convenience stores in the U.S. -- where I ordered a sandwich. It was all done on a touch screen. I picked the sandwich, bread, toppings, condiments via pictures. I was able to add fries or onion rings to the order. It was the first time I had ever done this and it was a clear picture-based interface. When it was placed, out popped a receipt. while my sandwich was being made, I took the receipt to the counter with the cash registers -- for the whole place, not just food orders -- the scanned the bar code on the receipt and I paid. The person taking the money did not have to take my order and was able to handle other customers not ordering food.