Yes, it is the best medicine. But along with it, one must do the proper hishtadlus. You can consult your LOR as to what adequate hishtadlus is.
Denigrating doctors and medicines doesn’t feel like the right thing to do. Hashem created all of the medicines out there, and they are all so magnificent and amazing.
So yes, you are right that we need to remember to daven to Hashem for refuos, but to write off the magnificence of the medical field as “100% false” is most definitely the wrong perspective.