You're not bothering anyone if you stay to the right (assuming US) so they can pass.
In fact, I think it needs to go a step further - ALWAYS stay to the right. Only move to the other lane to pass or turn left.
Passing left laws were intended for two way streets with one lane in each direction when the only way to pass is by driving on the lane going the opposite direction.
Do you have a citation for that? Many state laws use the speed of traffic as a reference to define slower as opposed to using the posted speed limit as the reference. If they meant to say only slower than the speed limit, then the text of the law would be explicit on that point.
Having less speed variance leads to smoother flow and traffic that's more spread out. That increases safety overall.
No thanks!
Generally its the middle lane I use, but sometimes it's even the left if some landscaping truck or cement mixed is in front of me dropping who knows what into the road.
The chief component in getting to one's destination is the traffic and the second one is number of lights you get stopped out. Since all the lights are timed to 40mph it doesn't make sense to go faster unless they re-engineer the road.
Generally any car that passes me will be stuck at the light ahead and if there is light traffic I will pass them because I have a rolling start and if there is heavy traffic it's all the same.
Staying to the right in this situation only makes sense if you're unable to accelerate at a reasonable speed or unable to go the speed limit at all.