Psychedelics (and Brazilian law) happen to be the theme of my graduate thesis, one I'm currently expanding into a book. I've had many experiences with psychedelics, specially Psilocybe cubensis mushrooms, but I never took a dose that led me to see solid shapes or entities without first closing eyes. Most of these were great, and the ones that weren't were at least enlightening. I'm also very glad that the time of scarecrows like Charles Manson or fearmongerers like Richard Nixon is gone and we can finally not only openly and informedly talk about pros and cons, but also restore the medical use of these substances.
That being said, I don't think it was particularly wise to experiment with psychedelics, and I fully support the Orthodox being wary of them, since they may induce dreamlike states that leave us spiritually vulnerable to demonic influences and prelest, but I don't think people outside the Church should be forced into sobriety either, specially if there's a religious or medical context.
There's a really hard job coming up for our bioethicists, who need to debate to which extent it might be permissible for Orthodox Christians to undergo treatments with psychedelics, specially since they're all so different from one another. For example, no psychedelic I'm aware of induces dreamlike states at low doses, some like LSD won't provoke those even in average recreative doses, and some like MDMA won't even at high doses. There are some psychiatric conditions for which psychedelics can be extremely useful, like MDMA for PTSD, ibogaine and DMT (as in ayahuasca) for drug addiction, DMT and psilocybin (as in magic mushrooms) for chronic drug-resistant depression, DMT and LSD for neurodegenerative disease, and DOI for brain inflammation. I have tripped my way out of my worst OCD breakdown ever myself, using fully legal magic mushrooms.
If our bioethicists don't catch up, we will be left with very poor generalisations that won't match the quickly coming novelties, and all will be left for parish-level guesswork. Until then, the best thing to do as Orthodox Christians is simply to follow the law and avoid losing complete control of consciousness.