Poetry, I think, intensifies the reader's experience. If it's a humorous facet of the story, poetry makes it more exuberant. If it's a sad facet, poetry can make it more poignant.
Vikram SethQuietly they moved down the calm and sacred river that had come down to earth so that its waters might flow over the ashes of those long dead, and that would continue to flow long after the human race had, through hatred and knowledge, burned itself out.
Vikram Seth