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While not always too significant, many credit cards also offer points or cash back. I do the same as you (use my credit card for practically everything and always pay it off), and can use whatever points I get to make small mortgage prepayments, buy gift cards, etc.
I solely use an Amazon Chase card. I buy a lot from Amazon and still get cash back to spend at Amazon when making purchases elsewhere. I buy the occasional game for myself at no cost and when Xmas rolls around I can buy a number of gifts with Amazon points.