I am a male and over 25. I happen to a be a civil engineer who has studied traffic design and optimal flow patterns. I also happen to have taken several defensive driving courses offered by very different organizations. I also have taken several advanced driving courses through the National Auto Sport Association. In addition to all of that, I spend more than 10 hours per week driving controlled access highways.
As far as my driving habits, I drive less than 10mph over the speed limit, and leave a generous amount of following distance. I don't even own an automatic transmission vehicle and I do all my own maintenance. I know cars, how they work, how they behave. I know roads, how they are designed, and how to optimize their use. I know people, their behaviors, and their attitudes.
Yes, lane discipline requires more lane switching. If you properly adjust your mirrors and you have the foresight to buy a car with good visibility, you have no blind spots. If you follow the good practice of checking your mirrors often you are aware of the vehicles around you and always aware of when you can make a safe lane change without taking your eyes off the road (doing a head turn). Drivers on the autobahn manage to safely have high speeds and large speed differentials without statistically higher rates of accidents because they are well trained drivers and keep to the right except to pass.
In my knowledge and experience, far too many people think they are justified in sitting in the middle lane because they are going the speed limit or better when there is no justifiable reason to be there. All it does is force more lane changes or right passes from people following the rules and form the worst case scenario for safety which is essentially a rapid in the middle of the road. Merging traffic is only an excuse in old urban highways where there are not adequate acceleration lanes. In the rest of cases, those defensive driving instructors should be teaching people the accelerator pedal is the only pedal you need to merge into traffic. You need to be going the speed of traffic on the highway or greater before you attempt to merge. People in the right lane have the right of way and have no obligation to move over or give you space, it is simply courtesy to do so.