I agree 100%. I didn't mean this as a knock against doctors at local hospitals either. The pediatrician who diagnosed my daughter is a perfectly solid practitioner in a small town in New Hampshire. Not every doctor is going to make a breakthrough on the order of Marshall & Warren, Banting & Best, or other Nobel Laureates. That's ok. The middle of the road physician will save millions of man years worth of lives over the course of a career, any parent should be proud if that's "all" their child accomplishes.
Interesting that you bring up Marshall & Warren - in my opinion the truly interesting part of that story is their fight for truth above dogma.
I think you want that in a doctor - a capacity and preparedness to fight the system when it is wrong, unfair, of hurting your patient. Is that a creative skill? I don't know but I doubt it's born out of conformity.
Incidentally I know Dr Marshall, he's an academic at my medical school. He actually paid me to teach him and his team Ruby.