I've been using WordPress and Git together for several years. I started out by storing everything in Git. This meant that the repo contained server configuration files which required awkward workarounds, such as using a switch statement in wp-config.php and creating a fancy .htaccess file. Updating WordPress was also a pain.
When most people start doing WordPress development, their workflow involves downloading a file from a theme or plugin via FTP, editing it, uploading it via FTP, refreshing the page, figuring out went wrong and then starting the whole process over again. This strategy, know as "cowboy coding" is not only inefficient, but dangerous.
Update 2013-05-15: I'm now using grunt-contrib-watch instead of grunt-regarde and grunt-livereload. It has a built in LiveReload server and is more streamlined. I updated the Gists, the tutorials, and my WordPress Starter Theme, Genesis Starter Child Theme, and Drupal 7 Starter Theme.]
