It seems that many commenters are missing the value of a demo combining effects in new ways, presented in a new context.
There are many app experiences beyond simple navigation that ask for and respond to actions/events - many would benefit greatly by expressive animation. I agree the effects shown are more distracting than useful, but this isn't a CSS template for folks to copypaste. It's inspiration to experiment and discover the subtle, sophisticated, delightful details that make your app feel alive and exciting without going so far that it becomes a whirling and twirling abomination.
Use some design judgement. Don't sniff at the tech demo for being a tech demo.
There are many app experiences beyond simple navigation that ask for and respond to actions/events - many would benefit greatly by expressive animation. I agree the effects shown are more distracting than useful, but this isn't a CSS template for folks to copypaste. It's inspiration to experiment and discover the subtle, sophisticated, delightful details that make your app feel alive and exciting without going so far that it becomes a whirling and twirling abomination.
Use some design judgement. Don't sniff at the tech demo for being a tech demo.