I don't disagree at all. As I said I think it may be worthwhile for some people to take LSD. It would be so much better if it were legal and we could take a serious look at how to reduce the harmful part of taking it, and also look at perhaps genetic or other factors which mean that some people really shouldn't be taking it.
I think the "brain-addled delusions" you describe can be appreciated as rare and useful shifts of your own perspective even if that's all they are. Sure, there's nothing supernatural about it, but you may still have valid insights which you wouldn't necessarily have arrived at during your morning commute.
Our mundane, day-to-day perspective on the world, on some level, is only distinguishable from "brain-addled delusion" because we're desensitized to it.