The microscope was a tool for observing a new layer of objective, real, reproducible phenomenon within a previously inaccessible layer of our universe. Now, considering the conversation we're having, feel free to take "objective and real" with a grain of salt, but what I mean is that they are internally consistent, verifiable, reproducible, etc.
Psychedelics have so far proven to be capable of temporarily rewiring our already highly flawed, subjective consciousness computers, in ways that can be potentially useful, but mostly seem to produce epiphanies that are rooted entirely in subjectivity, entirely fabricated. I don't really care at all if you had an experience that told you that all life existed on a 4 dimensional tetrahedron rotating through time. I do care, though, if you saw some behavior in a bacteria through a microscope which other people can observe and similarly draw their own judgements from.
That doesn't mean that I don't think that already intelligent people can't benefit from an occasional new perspective, potentially brought about by psychedelics in the same way that it could be brought on by a move to a new country, or a walk outside, but that doesn't mean that I think that psychedelics are the gateway to an entire frontier on consciousness.