I would not have hoped that a high percentage of surgeons have that trait. I wonder if I am guilty of it as well. Something to examine in the mirror in our future endeavors.
Before germ theory gained acceptance or was even understood, physicians and surgeons considered themselves above hand washing as a gentleman's hands are always clean. Ignaz Semmelweis discovered that washing hands and tools in chlorine solution reduced childbirth deaths. But he was unable to convince others.
In modern times doctors have answered a survey on the effect of pharmaceutical representatives visit. The overwhelming majority responded that they are not swayed by drug saleswomen, but that other docs are susceptible to choosing a prescription drug because of salesmanship instead of only efficacy & risk.
[1]: https://en.wikipedia.org/wiki/Illusory_superiority
Dunning-Kruger is something more specific, that people with lower skill in an area overestimate their skill, because they are unable to distinguish competence in that area.
On HN, everyone thinks that everyone but themselves are affected by Dunning Kruger. In fact, calling out Dunning Kruger in others is a symptom of someone under the very same effect.
The effects you talk about definitely exist and I feel like a lot of those are arrogance, or possibly even our fundamental inability to observe without bias unless we take very careful precautions ahead of time. Perhaps doctors otherwise used to proper experimental control and thinking scientifically didn't apply the same precautions ahead of meeting with sales reps, because that appeared to be out of context of practicing medicine at the time, even though it is still part of the process. Apparently they are affected by bias without being aware of it. This is wholly conjecture on my part.