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I have several. I do run a balance on a couple of them but only because I feel better about buying certain things over several months rather than laying out the cash in one chunk.
I could buy the things outright but I have a tough time overcoming the thought "that's a lot of money". I determine how many months I will take to pay something off and what that means in interest. I then decide if the use or pleasure that I will get from the item is worth it (in many cases I then decide it's not).
Credit cards are also useful to rent cars, reserve hotels, etc as others have said. One of the biggest advantages is the extra insurance that comes with paying by credit card. If a transaction in which you paid cash goes south your only real recourse is going to be court (unless you can put a hold on the check or something). With a credit card I can dispute the charge. Additionally, when renting a car, buying airline tickets, booking hotels, etc I get automatic insurance in case something happens (accidents, travel cancellations, delays, etc).
Credit cards can be extremely useful but, as others have pointed out, they can get you in a hole that will take a long time to get out of.
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Strive to be more curious than ignorant.
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