Those are technically called "cycle tracks", and are very similar to what is found in Europe for bicycle accommodation along roadways. Based on what I've heard, some people around here like them, others don't. There are a few problems with the way they were designed and built, mainly that unlike most of their European counterparts, the cycle tracks were built at the same grade as the sidewalk, which results in pedestrians wandering into them. The idea is that the pedestrians walk on the sidewalk part and the bicyclists use the cycle track part. Also, there have been some issues with snow plowing where the cycle tracks have been inaccessible to bicyclists.
Personally, I don't love them, and I don't hate them. I am just as comfortable riding in the road, but I don't think I'm necessarily the intended audience.