Earlier quoted context omitted.
I honestly can't tell if you are being serious or not. If you are: expand on "obvious usefulness." If you aren't, congrats on telling a joke on HN and still getting upvoted.
Erm... for sorting and filtering data in a way that implicitly describes the transformations in the presented dataset caused by said sorting/filtering through the animation effects. Information density++ I honestly see this as obvious. I'm not trying to be funny. And I can't work out if you don't think this is obvious, or you don't agree that this would be useful. Just imagine it on an ecommerce page: http://www.goog…
At the end of the day, I think it's polish that for almost all cases the user will be better served if the animation were to be turned off since it is a waste of time. It is very cool though!