Menus can add ease of navigation of your site, especially if you have a relatively large site with many choices. For some reason, I like it when you select an item from the menu and then click on a submit button. I just think this is more pleasant for the Web. You will find other implementations elsewhere. Again, as in the previous examples, moderation is the key.
Most Web sites overdo the use of menus, with several on one page or with dozens of items.
The purpose of menus is to make site navigation easier, not more complex. Limit yourself to one menu on a page and a reasonable number of items. This is a really cool script. I hope I have given you some ideas of how to spice up your site. Implement some of these examples, and your site will be animated and lively and, best of all, once you set it all up, you're done.