A little late but I'll chime in too...
We use 2 major CC's: Amazon for online purchases and my American Express Gold for everything in person, plus any travel or large consumer purchases. Amazon card has great cash back incentives, even on non-Amazon stuff. The Amex has slightly less rewards but has hugh protections - everything from automatic travel insurance to taking a return on an item that a store wouldn't accept. It has saved us thousands of dollars over the ~14 years that I've had the card.
Like most of you, our cards get paid monthly. Despite our modestly-high salaries, my wife and I aren't "big spenders". There are months where we spend a few $100 to a few $1000 more than normal, but it all averages out as there are months when we buy next to nothing other than the bare necessities. We have dedicated savings accounts, plus health savings accounts, and retirement accounts, as well as long-term "high yield" savings accounts (I use that term loosely since the interest rate is garbage) for things like vehicle purchases and big house stuff. For us, thankfully, CC's are a "positive" financial tool and not a burden.