I usually spend a lot of time watching YouTube videos in my spare time, though the website is not bad at all, there are several other tools that you can use to enhance your experience with YouTube.
DeskTube is a Adobe Air application that will let you watch YouTube videos from your Desktop. The application also provides you with a option to search for videos and view without having to go the YouTube website.
DeskTube also allows you to view the top rated videos, most viewed videos, recently added, most commented videos and recently featured videos through easily clickable links.
In addition to that you can also login to your YouTube account and browse your favorites or add videos to your favorites.
Overall the application brings the entire YouTube experience to your desktop.