I don't think those expectations are the fault of the patient. It's a natural extension of our drive-thru, fast-food.
At very least, I've found those expectations to be common in most of the 20+ hospitals/ER's that I've worked in over the past 15 years.
I field at least 3-4 calls a night asking for advice. I am not allowed to give any advice over the phone because of liability reasons. People's only option in the middle of the night is to go to the ER and wait their turn which creates frustration and high expectations. It's a bad system, not bad patients.