Of course everyone's different, but to me "hallucinate" is a bit too strong of an expectation anyways. Or perhaps "hallucinate" is technically accurate, but I've found that uninitiated people expect to have crazy full immersive seeing-things-that-aren't-there experiences on psilocybin (like how DMT trips are described) but almost everyone I've talked with about this stuff has "visuals" and certainly interesting mental imaginings, but not full-fledged hallucinations.

Like shifting patterns of colours and light that overlay your regular vision? Sure. Morphing patterns in things that are actually there like plants or carpets, like your brain can't "keep it straight" for more than a millisecond? Yup. Ability to "travel" in your minds eye into past memories? Totally. Feelings of union with God/Source/Divine/Other/Higher_Reality? You bet.

But not like full-fledged high-fidelity sights and sounds that one would mistake for reality as you normally perceive it, like a man standing there or a crazy monster appearing right in front of you.

Interestingly, it appears different strains of mushrooms produce different amounts or types of visuals too, and I'm sure there are hundreds of other variables also at play (captured in 'set and setting').

Thank goodness this stuff is being studied properly again.