This is a little weird when used to open UI elements like the dropdown before you've clicked them. But it's a great solution for loading content, just in time, before a user officially takes an action, rather than making them wait around.
Seems like you could easily hack up the algorithm to enable "drunk mode" on web apps.
Not that you'd want to do that...
Imagine a form built with this thingy xD
Why I didn't like it? This takes away a fraction of my freedom while using a website. I need to choose what I want to see and I definitely don't like the idea of forcing a dropdown on my face just because I got close to your friggin' button. . A lazier solution may not always be a good solution. ;)
It's an interesting concept but I don't know how much time it saves. It is also not accurate to the point of being trusted (from what I tested). It certainly doesn't hurt to add it though!
This makes my blood boil. (╯°□°）╯︵ ┻━┻