Maybe not crucial, but lessons are surely to be learned by every fragment of reality we are able to perceive. To do so though, we must remain open; in a non-judgemental state. In a modern society that basis itself on the judgemental mindset and social status; this can be a difficult task to accomplish. Many of our predefined neurological processes, so to say our 'filtering mechanisms', fall under the barrier of the subconscious; so much so that consciously, we may think we don't view the world in any pre-defined manner.
Mushrooms bring you to this state of openness and mental clarity, humbling you to the world and indeed your own patterns of thought; and allow much more through your scope of perspective.. information you would otherwise not had access to. They are certainly a tool for healing on many levels.