Maybe its my computer as its old but I can't believe this hasn't been discussed here. Posting in this section as I came to researching it via Terrance Mckenna and he seems as spiritual as it gets.
Although i'm wondering about the whole Bardo thing and spirits/gnomes/elves coming to life in front of you. I've done some of the stuff he's discussed (morning glry seeds/hawaiian woodrose) and felt absolutely nothing. Also the mushroom experiences I've had are at the root of my spirituality I have yet to see spaceships flown by alien bugs.