I checked out one of the templates on the page you linked to and it took far too long on my very fast cable connection. Stay away from that stuff! It doesn't help anything and doesn't make you look any better!
Here is an article from the usability expert Jakob Nielsen. It is a bit old, but the kind of problems that he discusses and still very real with flash. (Just so you don't think this is all about a bunch of web site luddite elitists!) http://www.useit.com/alertbox/20001029.html