David Meza, an engineer at NASA, uses Neo4j to analyze and visualize data relationships between different projects, such as the Apollo and Orion missions. He chose Neo4j due to its ability to connect data across various spectrums and make it easy for users to visualize and explore complex relationships. Using Neo4j has allowed David's team to save time and money on recent projects, uncover trends in unstructured data, and connect siloed repositories. If he could go back to his first project with Neo4j, he would have better understood the data model and shifted his thinking to focus on relationships and connections. He praises Neo4j for its scalability and capability of handling large amounts of nodes, making it a valuable tool for NASA's "big data" challenges.