You have to realize Dave Ramsey's target audience. Those that have not controlled themselves or are self disciplined. That's why he preaches no credit cards. Those people can't control themselves.
For those of us who can. We carry no balance, and use the card as cash, we pay ours every 2 weeks. We get back a nice chunk buying only what we normally buy.
Two weeks? That's a little excessive don't you think? I just have mine paid in full every month automatically. My fico is over 800, and that's the real one, shopping around for some mortgages with these low rates these days.