Graph with Graphviz is a useful feature in Neo4j that allows developers to quickly visualize their graphs by outputting a graphviz rendering. This can be achieved using the Graphviz Component, which is a well-hidden gem in Neo4j. To use this feature, developers simply need to pipe the graphviz notation into a file and then render it using installed software such as Graphviz and dot on their machine. The resulting visualization provides a concise representation of the graph's structure, making it easier for developers to understand and analyze their data.