I have gone to doctors that felt their time was much more important than my time. They seem to forget who the customer is and who is paying their fee. I tend to fire them!!!
A friend of mine son, is a doctor, and he said that doctors in general, are afraid of people, who would bad mouth them, to their friends and neighbors. I have had only one doctor in my lifetime, who was sensitive to complaints.
My PCP does not overbook, as he keeps a couple of appointments open for people who have an emergency. For now, my PCP takes me right away, but I usually sit in his examining room, for a while. He is worth the wait.
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).