I regularly consider doing this. Obviously it is great from a privacy perspective. But I hate dealing with cash, especially change. With cards I just have one thing in my wallet and it just works forever. My bank account is automatically charged at the end of the month. With cash I need to keep refilling my wallet and carry around annoying change.
I would love to have something digital but also private (like Monero). But so far I have been picking convenience over privacy.