I could not imagine living without my debit cards, getting gas would be a total bitch. Whenever I get change back I just put them all in my pocket minus any coins I usually leave behind. I've been in the US now for about 2 years and I still can't figure out the difference between a penny or a dime or even their values
Just having to carry around a card for everything is by far the easiest way to go and well worth $5,-