As an American, the only thing I don't spend on a credit card is rent (because my landlord doesn't accept it).
It's silly not to pay for everything on credit cards here, when you can get 3-5% back on anything with the right card. That's around $4k/year if you spend $100k before even accounting for doubling on some cards and other benefits like travel vouchers, Uber credits, and free insurance coverage. (Minus a $600-$1000 a year in annual card fees for high end cards.)
I imagine that spending is dominated by a few major categories, which you can find specific cards to cover. There are spending limits, but you can always get multiple cards. I do that with BoA, I have 2 basically identical credit cards, but each has a different bonus category set, or I can set both to use the same category like dining out.
So unless you're spending like 200k net a year on life expenses, it's pretty easy to get the max returns.
You can get a pretty good, simple system set up with Chase CSR and FU, supplemented with the Amazon card. Just have to remember to use the CSR for the relevant categories, which isn't that hard.
As an American, I don't care if I get 0% back, I'm still using a credit card because the identity theft protection discrepancy between credit and debit cards is enormous. I say this to people and those who have had to deal with identify theft before immediate are on board with me. Those who haven't proceed to argue.
Basically, when you purchase something with a credit card the bank fronts the money to the merchant and bills you for purchases later. If a transaction is fraudulent, either the merchant or the credit card company take the hit, and you're never out any money, even temporarily. For credit cards the market has settled on 0 consumer fraud liability pretty much no matter the circumstances (and very hassle-free too).
On the other hand, with debit cards money is withdrawn from your account when a fraudulent purchase is made, and you need to wait for your bank to complete an investigation to reimburse you. They also tend to have rather stricter reporting standards in that if you don't report fraud promptly, you might be stuck with (some) liability.
Either way you'll typically get your money back, but the hassle is much reduced with credit cards.
The US (and Canada) have much weaker consumer protections for debit than credit.
If a merchant posts a fraudulent transaction against a credit card, you'll most likely get your money back. If a merchant posts a fraudulent transaction against a debit card, you might not get your money back.
More dangerously, if your debit card credentials are skimmed and used to withdraw money from your account by any means other than the retail debit-card payment system, you won't get your money back.
It's silly not to pay for everything on credit cards here, when you can get 3-5% back on anything with the right card. That's around $4k/year if you spend $100k before even accounting for doubling on some cards and other benefits like travel vouchers, Uber credits, and free insurance coverage. (Minus a $600-$1000 a year in annual card fees for high end cards.)