I'm the same. I periodically think I CBA with it any more, then get there, get all set up, start playing, and it's good again.
My most recent extra smile was on Tuesday, when we did a guest slot at an open mic night with an eye on getting a few gigs at the pub in question. Our percussionist normally does a harmonica solo in "Three little birds", but just as he came up to it, realised he didn't have the gob-iron in question with him, so I stepped in and did a kazoo solo.