Users appreciate the simplicity and effectiveness of the WordPress plugin, praising it for seamlessly providing the necessary functionality, specifically adding unique IDs. They find it extremely helpful and reliable, highlighting that it works perfectly for their needs. However, a notable drawback mentioned is the inability to hide the field on the backend, which some users find unnecessary and prefer to keep out of clients' view. Overall, the plugin's straightforward approach and essential functionality like adding unique IDs are highly valued.