As a lifetime computer user, I had an undeveloped sense of the value of human interaction. A few rounds of Ecstasy with friends showed me that there was something deeper to be explored. Did I know that the experience was due to the drug? Of course. Did experiencing that closer human connection, even if transient, make me a better person? I think so.
Also, as a lifetime computer user, I live in a world of certainty: 1+1=2; algorithms work the same way every time; my computers only do what I tell them to do [har har] and don't talk back. A few rounds of mushrooms shook away that blinding certainty. It turns out that I can see vastly more shades of green than I knew, that what you think of as depth perception is but a shade of what I saw then, that your visual center can be seriously and awesomely tricked, that you can close your eyes and spend hours watching Escher-like images unfold and evolve. Does it matter that I've seen a shade of green that you probably haven't? Not directly. Does it matter that I'm not blinded by certainty as you are? Definitely.
Obviously, I'm not advocating Mr. Saunders' methods, but there's more nuance in this discussion than your comment reflects.