I use the bicyle lane when there is one. But in the city with cars parked on the road side I simply have to keep 1 meter distance to the side to avoid dooring (google it!) and that puts me into into the middle of the lane. Which in turn means that cars behind me have to use the oncoming lane to overtake me. If I were cycling more to the side the cars behind me a) wouldn't slow down b) overtake me with little to no space around me and thus endanger me in all those unexpected siutations on the road. Also, who said those roads are just for cars? Roads have been around since roman times, unlike cars.

99% of the time: what bicycle lanes? Even then bicycles aren't legally or morally obliged to stay in them if it's unsafe to do so.

In some countries, if there's no dedicated bike lane you have to cycle on the road. Germany, for example.

A huge amount of roads doesn't have bike lanes.

I think roads are not a place for cyclists to be. For the security of everybody only motorised vehicles should be able to use them if they have no bicycle lane.