Count me in the camp that always wears gloves. I used to switch to half-finger gloves once it warmed up, but last year I started using full-finger gloves year round. A little more convenient when commuting since I don't have to pack an extra pair for the sometimes chilly mornings. We'll see if I still feel this way when temps get past 100 deg F.
Oh, and +1 to the minimal/no padding recommendations.
As far as wearing motorcycle gloves, I'd love to wear them in the winter, but my bicycles don't have a 12-volt outlet to plug the gloves into.