We tend to view metaphor as just a way of speaking that is not literal. And there is some language that is nonmetaphorical. But most complex thoughts involve metaphors, to the degree that speaking literally would be less useful.
Most of us use metaphors unwittingly, per the conventions of society. But innovative metaphors have a role: they allow us to change our thinking for our benefit.
New metaphors allow us to experience things differently. They actually change our brains.