The exec command in Go offers versatile applications for enhancing command line interfaces, particularly in facilitating user interactions with text editors. Leveraging the exec command, developers can create temporary files to hold content that users can edit in their preferred text editors, thereby providing a more user-friendly interface compared to traditional CLI inputs. This method not only enables smooth content updates but also optimizes the management of larger text documents. The lesson highlights the importance of using environment variables, like the `EDITOR` variable, to accommodate various user preferences when opening editors. By demonstrating how to create, write, and read from temporary files, it lays the groundwork for building intuitive command line applications that enhance user experience.