[esperent]

I would say I have quite a bit of experience with psychedelics and I mostly agree with you - traditional "hallucinations" are quite rare and dose dependant. Experiences like those described in Huxley's book are by far the most important and interesting aspect of tripping - and I urge anyone curious to read that excellent book.

On the other hand, I absolutely have experienced amazing, deep, beautiful, true pop-culture style hallucinations. Usually visual, both geometric patterns but also full on creations of new worlds, entities, landscapes, and more. I've also experienced hallucinations that are multisensory and go far beyond the ability to put into words. I am a very visually focused person with a strong mind's eye, possibly that is related.