I actually use cash as often as possible, but not out of paranoia or privacy concerns. You can't avoid being a drop in the sea of data collected nowadays, and it's awfully self-centered to think that a for-profit corporation gives a rat's ass that you bought a beer. Using that information to determine my insurance premium? Yeah, that would be a problem.

I tend to use cash simply because I'd rather have more of the money I spend go to the actual retailer (especially if it's a small business) than the bank. As a former retail business owner, I know how oppressive transaction fees are... yes, even debit card purchases.