I’m not sure what meditation centre you’re talking about, I’ve never been to a meditation centre in my live.
What have done is undertake a lot of research.
What “Shamanic” tribes are we talking about? Let’s use Hultkrantz’s definition of a Shaman (although obviously it’s a disputed term) “a social functionary who with the help of guardian spirits attains ecstasy in order to create a rapport with the supernatural word on behalf of his group members”
”Shamanism” is obviously largely a modern concept grouping together of people who perform similar activities (like many such grouping the contemporary view would have seen them as distinct).
it’s an interesting topic but how they achieved “ecstasy” would be the pertinent point here.
For the vast majority of situations, the oral traditions make it possible to know (traditions with unbroken lineage are few and far between and certainly really unheard of in Europe where we’re are discussing)
Mccoy in “The Viking Spirit” states that “there’s no evidence for a widespread use of entheogen” although concedes there was probably some isolated usage.
instead he lists music, breathing dance and ritual. This seems most likely given practices which are recoded increasingly often in esoteric experiences in Europe from the Middle Ages onwards. Indeed my own practice (and those of others) would back up the effectiveness of these things. Of course “Odin magical meed” could be anything - alcohol is likely to be insufficient but it doesn’t necessarily mean the use of hallucinogenics.
Of course it’s impossible to totally exclude the possibility of the use of Mushrooms of pre written record tribes but it certainly is not something scholars have found much continuing evidence of in Europe from all the sources I read.
However, repeatedly states of ecstasy in the west are recorded as being through breathwork, music, chants, ritual and mediation. these are the practices still used today.
I am not trying to say some people don’t find these experiences useful, I know many who regularly partake in mushroom and ayahuasca ceremonies who have experiences similar to those I’ve achieved otherwise (although with less committing and shitting myself).
No doubt Huxley was right about the necessity or not of such things.