This one's really good... sometimes I get sick of songs I like too, and they start to lose the excitement that they had during their time. It works the other way too... some songs you don't like until you've listened to them a few times. In fact, most of the music I really like, took me a few listens to get right into it.
Having stuff on my playlist can ruin some really special songs for me... so I keep them tucked away for special occasions. A few of my favourite bands are the ones I don't listen to the most often... like Sigur Ros, or Pink Floyd. I tend to pull those out if I feel the need to listen to them, but don't overplay them for fear of wearing them out.
Then there's the music I used to like, that I go back to with expectant lips... heh... and think, when did I listen to this crap?
Facts do not cease to exist because they are ignored.