These are incredibly distracting. I'll have more to say on these shortly. For now, I'll only say that most of the animations I've seen are pointless, cute but no more. They are confections. As Bruce Sterling once said, no one ever cried over the beauty of a cupcake.
Advertising is another kind of distraction.
Many advertisements offer hidden counters as an inducement, but they're not worth it. You can assume that at least that many people leave your site to follow an ad, and they may never return. Your reader is not an idiot If a person has been using a web browser long enough to find your page, they probably understand what a link is, and how to activate it. Being cool generally means that your web site isn't so cool. A lot of it is counter-productive.