I do not know what "monomyth-structured" means, but yeah, my getting familiar with the heuristics-and-biases literature caused me to decrease my consumption of fiction -- particularly TV, movies, etc, since the critical thinking pretty much shuts down when watching TV, movies, etc.
Tyler Cowen argues in a TED talk (~15 min) that stories pervade our mental lives. He thinks they are a major source of cognitive biases and, on the margin, we should be more suspicious of them - especially simple stories. Here's an interesting quote about the meta-level: