delirious_owl is being pretty inflammatory but they make a good point.
All too often a supposed "bike lane" is just built to a worse standard than parallel car lanes. It will have a worse road surface, sharp bends, confusing and long routing, less priority at intersections and traffic lights. Car lanes are the default and bike lanes are squeezed in as an afterthought.
This needs to change, bike lanes should be built to the same or higher standard as roads(although typically bike lanes can be much narrower). Multi lane bike motorways need to be buldozed through neighborhoods. An easy way to do this is just take part or all of an existing road and make it bike only.