The significance of user journeys in product development lies in their ability to illustrate the customer experience from initial contact to the end of interaction with a product or service. Mapping user journeys helps identify pain points, preferences, and areas of improvement, allowing product teams to design solutions that better meet user needs. By understanding the desired outcomes and behaviors of users, developers can create more relevant features and streamline the user experience. Ultimately, focusing on user journeys leads to higher satisfaction, increased loyalty, and better product success.