Users appreciate the WordPress plugin "Duplicate Pages, Posts and CPT" for its efficiency, ease of use, and reliability. They find it particularly beneficial for duplicating various types of content like events, pages, posts, and custom post types, saving considerable time and effort. The plugin is praised for its simple installation and operational smoothness, with no issues even after updates to WordPress or themes. It delivers on its promises with quick functionality and is valued for being cost-effective. The predominant drawback noted is that earlier, other plugins caused confusion with URLs, but this plugin works flawlessly without any issues.