I am not but you seem to.
Your explanation for a psychedelic experience is that the term was coined in the mid 50th. So are we purely talking about semantics ?
In any case lets agree that it is an altered state of mind.
And that the word psychedelic in his contemporary use (semantics) implies different things not only drugs, which in its origin might or might not have.
Exactely!
It is after all a mental state.
It is a profound state of intensified perceptions, which can be triggered by different things.
Music - Meditation - drugs - etc..