Useful plugin for designers and dev

This plugin is an excellent way to figure out what theme files are being loaded in your theme and has worked pretty reliably for me when I work on large sites w/ more intricate content templates, etc. It serves as an easy reference and this plugin is quite useful. I could probably eke by without it, but having it saves me a lot of time from referencing the WP visual hierarchy chart. The longer I work with wordpress, the more comfortable I get w/ where things are located and from what part of the theme things are being generated from, but even as a more intermediate or advance-level user, the plugin still saves me time.