I get 1.5%-2% cash back with everything purchased with it. I'd be losing money by using a debit card instead. Not to mention the $500 they gave me just for signing up for it.
I also don't to worry about when I get paid. I might only have $100 left in my checking account when I need to buy groceries if the day I get paid falls at a weird time. I don't have to worry about that sort of thing with a credit card, although it is much less of an issue now that I actually have savings than it was when I was in college.
If someone steals my debit card or my cash and uses it, my money is gone. My bank would probably refund me the stolen money if my debit card was used fraudulently, but until that happens I'm still out however much of my own money.
If they steal my credit card, who cares? I'll call the bank and cancel it and in the mean time, none of my actual money has been touched.
> If I need more I go to the Bank's ATM and get more. Easy.
Not having to go to an ATM is even easier than having to go to an ATM.