Here is a way to look at it... do you have a dentist? Is your dentist (off the top of our head) a DDS or DMD?
In about 95% of the practicing world (especially private practice and not top tier research institutions) thats how it goes with patients. You ask them this question and they have no freaking clue, all they know is that they go to the dentist and their teeth get cleaned. Its a good analogy for the whole MD/DO thing... heck my father still thinks he is going to a doctor even though he sees a NP who was grandfathered in... no one cares. They go to whatever medical office has the best commercialization in the community (or even just whatever is closest to their house), then they stick with whatever doc is friendly to them and helpful. DO's do just as well as MD's in private practice and most hospitals.