LOL I can't imagine how you could buy things over the phone, pay rego etc or shop online without one. I know it can be done but I like getting instant confirmation and receipts for that kind of stuff.
As to rewards, I link my credit card to Cathay Pacific's Asia Miles programme. It's about 10 times more generous than Qantas, even if you fly in a Qantas flight. I would have had over 20 overseas business class long haul trips at least. UK, HK, US, Japan etc I would otherwise have been flying economy or not going. I definitely get my $250 a year in fees back 10 fold. I was living in HK at the time I joined so that's 25 years ago.
I could go into a What Cheeses me off - Qantas, segway for days after that.
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Havent had a credit card for many years. Pay rego, insurance , rates, buy heaps of gear and all on line...definitely do not need a credit card to live on line. rEceipts are just as quick.