NancyLynn, I honestly believe that the reason you haven't had it commented upon is that the emphasis on good physical diagnosis has gone down SO much in medicine over the last thirty years.
In general, I agree with you wholeheartedly. My daughter has been the victim of two different doctors, each of whom ignored what I later learned were the classic symptoms of two different illnesses/conditions which I had been reporting to them - in one instance for a year (while begging for a referral to a specialist). Both of those missed diagnoses will have lifelong consequences for her - one impacting nothing more than her appearance, but the other may ultimately shorten her life.
On the other hand in medicine, as elsewhere, things occasionally happen because it is trendy. My experience tells me that during a period in the 80s (dont remember precisely when), diagnosing heart murmurs was the trend. It coincided roughly with the first big push to pre-medicate folks with heart murmurs for dental treatment probably not an unrelated trend.
Being told you have a heart murmur when it is borderline, and likely harmless, can be a frightening experience. Unnecessarily giving all individuals with heart murmurs antibiotics, regardless of the underlying cause of the murmur, in advance of every 6 month dental visit does not make sense from a public health perspective. My understanding (from speaking with nurses and physicians) is that identification of a heart sound as a murmur is not an exact science, and in some cases takes a skilled ear. In times when there is a lot of press (either within or outside of the medical community) about murmurs it is likely that more borderline cases will be at least initially tagged as murmurs. Maybe thats good maybe not. I can see both sides of that question, given the potentially serious problems a murmur can indicate.
At any rate, both the refusal to listen to patients in the absence of objective test results and the hypersensitivity to the "illness of the day" likely have their roots in the fertile soil you suggested declining diagnostic skills among far too many primary care physicians, and reliance on external stuff to do their job for them (whether it is lab tests, insurance company hoops, the pharmaceutical reps, pressure from patients who want a pill to make their cold (or whatever) go away, or press about the illness of the day).
ER docs rock, by the way. All our favorite and most competent specialists were picked up as a result of an ER visit (not quite the same thing as an ER doc, but if it hadnt been for the ER doc recognizing the problem and putting us in touch with the specialist on call I might still be begging for referrals). I just wish I had a more reliable way of picking primary care docs so it didnt take an ER visit to get to a specialist . . .
But that doesnt change the bottom line for purposes of this discussion, which is if you have been diagnosed with a heart murmur have it fully evaluated.