Clarinet, saxaphone and guitar. I'm certainly not professional level, but I've played in a variety of orchestras, big bands, blues, pop and rock bands, sometimes for money (perhaps that makes me professional).
I agree that being a musician brings different aspects of appreciation to listening to music, but I am very critical of those musicians who are of the opinion that a non-musician's experience is somehow less valid. In fact sometimes I think musicians get so wrapped up in the technicalities of music production that they themselves fail to see the wood for the trees, and are unable to distinguish "technically excellent, but dull as dishwater" music from "technically adequate, and great fun to listen to". It's always good to remember that the majority of your audience / record buyers are not musicians.