I think about that a lot. And I do notice that people coming towards you are always on the left wether it be walking on the sidewal, going put the stairs or in the supermarket. Its just the habbit of driving on the right hand side.
You should work where I work. At least 5x a day, I almost crash into someone walking on the left side towards me, usually right around a corner. Annoyingggggg!!!! Makes me wonder about their driving habits.