I haven't ever used this line but if I encounter a car stopped in traffic, waiting in the bike lane, I will just knock on his rear window and ask him if he's saving a lot of time.
Yesterday I encountered a slow moving lawnmower or tractor riding in the bike lane so that the cars could pass him. I almost got pissed off about it, but I just pulled in front of one of the cars and passed him as well. Not worth getting bent out of shape over.