Hear, hear to all that lisah said: ALWAYS pay it off each month. Having said that, I must confess that I LOVE my Disney Visa. I just started using it in mid-June and I will have over $100 of Disney Rewards by my next statement. I get free strollers, the DCA Meet N Greet, and discounts at many Disney restaurants with it as well. I also got a $50 gift card when I first signed up, so I've made a GREAT amount of Disney savings with it so far. I always pay it off (I check it every day or so and then immediately issue a payment from my online banking account for any new transactions), so have never paid a penney in interest. A GREAT tool for Disney perks. But NEVER keep a balance on it - the card has a 20.49% interest rate!!!
Keep in mind that many other cards also offer a 1% rewards program where you can get cash back rather than the 1% Disney Rewards. If you like the idea of cash rather than Disney credits, do a bit of research. I used to use my Citi credit card for 1% rewards (used to be 3%!!) and would do the same thing - charge everything to it, pay it off regularly, and then get a check BACK from them every so often. So look around if you want the $$.
I just get a little thrill with each purchase I make with my Disney visa knowing it makes our next DL trip that much sweeter (and cheaper!).