i will say that i am no longer in need of a credit card, but i still use it to gain the perks and rewards from it. we pay the card off automatically in full each month, but use it for almost all our purchases. that way, every dollar we spend we earn a point that we can turn in for airline miles, hotel stays and many other free perks.
I have often heard of this being called the "credit card float" and actually wrote a hub about it.
so to answer your question, that is awesome that you are no longer "in need" of the credit card, but used properly, you could be leaving some money on the table by using it wisely and having the right card. the right card meaning no annual fees, having an auto pay feature, and no restrictions on your points.
we have been using our Credit card for well over a year, and plan to fund both our plan tickets and some of our hotel stay with the free money earned by using the card for a trip this summer. all the while we have never paid a cent in interest or fees.
I find it fun when you find little ways like this to "get around" the rules.
hope this helps!