There are some great warm up exercises that incorporated the pinky. Some are posted on this site as free lessons. I suggest forcing yourself to use that little booger as often as possible. I really don't see how you have been playing for so long without using it. Choose exerises that force the pinky to press hard and stretch. In time you will be using the pinky as profficient as the other digits.

I know you guys probably never use the thumb, but with the type of music I do, the old thumb comes in handy as well. I don't use the thumb often, but it is awful convenient as times!