I only ever use cash for everything, other than bills which are direct debited from my account each fortnight.

These are the things which are debiting from my account each week:
Car payment
Car insurance
Electricity
Gas
Rent

I pay my phone bill at the post office with cash, I always have cash in my purse to pay for everything else.

For grocery shopping, I write a list and meal plan. I use the calculator on my phone to keep track of how much I am spending while Im filling up the trolley, so I dont get embarassed when I go through the check out.