> (Possibly controversial belief: riding a motorcycle makes you a better car driver. Motorcycling has made me pick up habits like always looking over my shoulder and not solely trusting my mirrors when changing lanes)

I hope that's not controversial, I fully agree with it. Riding a bicycle does pretty much the same thing, even though the evasive maneuvers take a different form. Motorcycles probably train some instincts that are more relevant to driving a car, though, given the speeds involved. Also, motorcycles train people better because they apply more selection pressure: there are plenty of inattentive bicyclists, and most of them are still aboveground. The inattentive motorcyclists, on the other hand, aren't around anymore to drive cars.