EmailMetrics is highly praised for transforming email management by providing real-time insights into time spent on emails, helping users prioritize and optimize their inbox time. Users appreciate its ability to reveal productivity patterns and identify time-wasting activities, making it an essential tool for managing busy inboxes. The extension is noted for its ease of use and privacy-focused approach, offering valuable statistics even in its free version. Overall, it is recommended for anyone looking to enhance their email efficiency and productivity.