It's quite odd to dismiss better sanitation and nutrition as not medicine, isn't it?
I think the problem is that we take for granted the things that have been discovered, because they were found a long time ago. Washing surgeons' hands in carbolic acid help puerperal fever rates. Cholera has something to do with water. Vaccination works. All those things happened way before any living person remembers.
From what I hear among pharma friends, the problem is also that the low hanging fruit has been picked. A lot of lines of inquiry are variations of the same thing, and over time we've found what is there to be found.
If you think about it, it makes sense that it's like that. Something really powerful like vaccination is going to pop out of the stats immediately. Subtler effects require more trials to detect.
In any case, it's a greater danger that there are people who don't believe in evidence based inquiry at all pretending to be medical professionals. Look at anti-vaxxers, or the Goop type quackery.