Taken in measured, clinically understood doses, sure. Taken to meet Vishnu, I assure you, none of what your brain experiences is normal function. Not to say they cause damage, but your brain definitely operates way out of spec for a while there.
Fair enough, I like the “operate way out of spec” language much more than “malfunction” but you obv have a point.
As someone who has met Vishnu more than a few times though I’ve very very rarely come back with a Lovecraftian dread (though the rest of the ant metaphor in OP not that bad at all)