Personally, I've seen a lot of this. "Retro" in medicine not only is hip, but it actually works. And often better than synthesized medicine.
You have to know what you are doing though, which includes knowing what modern remedies acutally do and what they were originally built for.
Example: I treaded my reflux with healing earth and baking soda (Natriumhydrogencarbonat (German term)). The regular doctor would've given me super expensive PPI and the effect probably wouldn't have been half as good. It took me basically 3 days to get my acid levels back to normal.
Example 2: Healing Earth/Healing Clay. No more anti-biotics or synthesized remedies when I have stomach problems due to an infection or stress, thank you. This stuff has upped my health measurably ever since the local RPG dealer recommended it to me back in college. I've used it to externally treat neuro-dermitis, stomach problems and acidic cold sores. This stuff does wonders. For some people it's tough to swallow though. I usually take a heaped table-spoon of dry healing clay (grain size 1 or ultra-fine) and wash it down with a glass of water. You have to brush your teeth afterwards, otherwise you'll be scrunching on what feels like fine grained sand.
Example 3: Fresh onions and fresh pressed onion juice for treating ear or throat infections. It smells, but it works. The soothing effect is almost instant, no thinking what a synthesized remedy with that effect would have to do. I use onions marinated in honey as cough syrup - it's the best there is. It's a bit of a hassle to make, so I do use stuff from the store aswell when I need it and am low on time, but the self made stuff beats the stuff from the store in both effect and taste, hands down.
These are a few examples of old-school remedies that are measurably better that the stuff pharmaceuticals try to push on you. However, there is modern medicine that I do use, albeit as an 'educated patient'. Modern anti-hystaminica for instance has gotten pretty good and effective with negilible side-effects.
Bottom line: There are remedies that have been around for thousands of years and still are the best there is for treating certain conditions, perhaps also for the very simple fact that we've evolved around those things available to us. That, of cource, doesn't mean you should shun modern medicine entirely or go all-out homepathic or some other weird stuff.
My 2 cents.