I am going to be the minority here, but I also rarely see people use bike lanes. I live in the north end and don't often go downtown where I know more people are biking. At least on N 125th/130th, Pinehurst Way, and even Campus Way near North Seattle College, it is a shock seeing anyone use the bike lanes at all.
I drive those routes five days a week. I am not against bike lanes, but... at a certain point when you don't see people using them you start questioning whether they need to be everywhere.