See, it seems like half of America seems to lack this discipline.

Credit cards can be a great tool if you have the money for what you a buying (and if you pay off the balance in full every month). You seem to have the discipline, and I'm glad you do, although I still wouldn't do that myself. What I worry about is when people don't have the money and say they will pay it off later during the no interest period. Not only does this form bad habits, but often times it won't get payed off during that timeframe.
I'm just saying an iPad is not a necessity and not worth potentially going into debt for when you don't have the money. If you don't have the money, don't buy it.