“Euphoria and insight,” as Roger Sterling said in Mad Men, but while the ‘visuals’ are what’s publicized, they really only make up a very small portion of the experience.
The #1 thing psychedelics do is make you unable to rationalize how important events and emotions are supposed to be, similar to the way a child thinks. In other words, it makes EVERYTHING seem incredibly significant, in a way it’s almost impossible to experience otherwise. You are INCREDIBLY attuned to small emotional / mood / vibe changes, and are in a heightened, much more “raw” state of being. This can be incredibly enlightening (or terrifying, depending on how your trip goes).