The Consumer Confidence number is based upon an opinion survey, done by something called the Conference Board.
http://www.consumerresearchcenter.org/consumer_confidence/It has nothing to do with numbers. It is a poll. While at the margin one or two of those surveyed might report feeling more 'confident' because they are saving a few bucks a month on CC interest your really talking about something else.
Your question about credit card tag is only one tiny part of the entire consumer borrowing mania, and negligible in its impact. The big dog in consumer credit is mortgages and home refinancing. After an enourmous blow off in both of those in the spring mortgage borrowing is slowing and refinancing is plummeting. Low or no interest auto loans come second probably. Then there are all the retail store supplied lines of credit with 'no payments or interest for a year' sort of things. Yes credit card companies are fighting to keep accounts by lowering rates and it does have an impactbut it is only one small part of a credit binge that is stupendous in its scope.