The trick is to get drivers to follow those markings. Where I live I see cars/trucks regularly park on bike lanes with little repercussion. Add to that a hostility between drivers and cyclists sharing the road; this might just be an issue where I live (Toronto)
Cycling lane poles would be ideal, but a lot of drivers push back on this since they see it as precious space being taken away from them.
In places where adequate protection was added, in some cases it was removed because drivers couldn't keep from leaving their lane. I guess drivers getting into accidents on their own is worse than lethal accidents involving cyclists on a bike lane.
It is space taken away from drivers, but drivers will treat a painted bike line as more space for a car. This is why the only safe bike lanes on a road with cars are ones that have physical protection from cars.
Cycling lane poles would be ideal, but a lot of drivers push back on this since they see it as precious space being taken away from them.