Implementing real-time data visualization in Node.js with Twilio Sync allows for instant updates to application states across multiple devices and users. The sports survey application demonstrates how to add this functionality using Express, Twilio Sync, and JavaScript. By connecting the application state to a Twilio Sync document object, clients receive updates in real-time when the document is updated, enabling instantaneous display of survey results on all connected devices. This example showcases the capabilities of Twilio Sync for building modern and interactive applications, including chat apps, online games, ride-hailing apps, and collaboration tools.