When it comes to being a sarcastic smartazz, I'm probably one of the worst offenders here but I can be serious too. I'm with RB here. When the doc comes in, I'm going to be fairly quiet and let them do their job. One component of their job is to ask questions of the patient to assess the state of their health. Maybe whacking your knees and elbows with the reflex hammer is of limited value but it was part of an info gathering process that's generally lacking now. A basic blood panel CAN be a valuable tool but it doesn't find everything and pointed questions are still probably the best method of evaluating a patient.
If you're lucky enough to have a good primary care doc then you have some degree of continuity and they can see changes in your body as problems develop. But when a doctor is booked 6 months out or more it can be nearly impossible to have that doctor see you when you have a concern. In many cases it's become more like oil change centers--just push 'em through and keep the volume where it needs to be.