Getting hit in the head can also change how someone perceives things. I think the above commenter was expressing frustration with the popular notion that taking drugs is some sort of shortcut to understanding consciousness, dynamic systems, etc
If you think drinking alcohol or taking cocaine has the same mental effects as psychedelics, then, I guess all I can say is don't talk about what you don't know.
> Getting hit on the head
Well - there are recorded cases of brain damage unlocking abilities and aptitudes (albeit with great rarity). So probably not recommended.
But rest assured, psychedelics are less painful, cause less damage and have a higher probability of beneficial effects.