I've been "cash only" for 8 months now and I love it. Of course I need a credit card if I buy something on Amazon or a one-off web store, but the point is to move as many transactions offline as possible. There are so many privacy benefits to using cash, but one that really resonates with me is the physical nature of it. When you pay for something with cash, you can feel the transaction of money exchanging hands and…
Funnily enough, I'm the exact opposite. Mentally, money in my account is "my money". Cash I've withdrawn feels like already-spent money. Since it's unaccountable, I tend to spend it more frivolously. Might be a generation-to-generation thing.
I think the mentality comes from using your bank's website/mint/etc to track your spending. Anything done with a card becomes a specific line item staring you in the face; cash, however, just falls into "miscellaneous".