I often need to know which page template is applied to which page. In some cases, it’s a lot of pages.
I would have to go to the quick edit screen for each page and then check the template used and make a note of it for future reference. That takes too much time.
So instead I wrote this little plugin that adds the page template information in a new column of the table at WP Admin > Pages.
More info about the plugin at codismo.com