Having used more than my share: there's plenty of question that psychedelics are mind opening. Just because something feels profound doesn't mean it is. People in the 1800s used to think nitrous and ether sniffing was profound.
You'd think after all these years of people experiencing profundity there would be some great work of art or philosophy that people are able to take back to reality from their drug experiences, but as far as I can tell it's just burn out "trippin balls" stories, people losing their minds in various unedifying ways, and weirdos like Kerry Mullis talking to aliens.