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 SethFiction basically is a form of gossip where you want to enter other people's lives, the lives of people you don't know, and you want to know what's going to happen to them.
Vikram Seth