Yeah, I wasn't too impressed with this article either. If you have the disapline to stick to a cash-only budget, I don't understand why one wouldn't have the disapline to use a CC for all purchases and then pay it off at the end of the month. To me the only difference is how you pay at the time of purchase.
I put on average $2k of purchases on my CC every month, and pay it off in full every month. I earn a free airline ticket every year for stuff I'm going to buy anyway. We have a budget, we stick to that budget. The only difference is we use a CC to pay instead of cash, and just pay off the CC each month.
We do have CC debt from our wedding, that should be paid off by the end of 2011. But we made that choice to do that, just like making a choice to take out a car loan or a mortgage. That debt is parked on a fixed low interest credit card, and we use a rewards card for our regular purchases. We haven't charged anything since then without paying it off in full, and don't see that changing. IF the CC companies start charging interest as soon as you charge it, meaning that I'd have to pay interest even though I'd pay in full each month, then of course I'd get rid of the card and go to cash or debit, but until then I'm happy with my CC and my free airline tickets.