As others have said, it depends. When there's a good lane I use it. Some of them are a joke.
I once had someone tell me that I shouldn't be riding in the road as there was a cycle lane, which is not the case in the UK. The thing that made this incident remarkable was that this guy was driving a minibus. I would have hoped that drivers of public service vehicles would know better. Of course, you don't need a PSV license to drive a private minibus, but you still expect slightly more of them than Mr. Joe Public.