I first tried LSD about 10 years ago and have taken various forms of psychedelics once or twice a year since. Some of them were, without a doubt, the most profound experiences of my life. You're right about the vague transcendentalist nonsense. The problem is there are no words to describe it adequately.
Despite only having pleasant experiences myself, I would never encourage any friend or stranger to try them. That is something only they can decide with their own research and risk appetite. There are absolutely serious potential consequences.
I think the worst consequence for me is that I have started to like weird music like psytrance even when sober.