But it's only for searching after you've already navigated to a search engine, right? You'd have to be extremely slow at peck-and-hunting for it to save you much time (especially as search strings are so short) - and in the video you have to click "submit" to even do the search (and then presumably navigate normally with mouse). I can't see many instances where this could be worth it. Maybe I'm actually too young to see why it's useful!
Maybe the search engine is your homepage, or you just have to hit "g" and enter to get there, or it's bookmarked. Maybe you don't have hands, but you have an easy way to move a mouse around and click. Maybe you're eating a sandwich with one hand and don't feel like putting it down. Maybe you won't use it for a short query like "weather", but you will for sentence-long queries. Maybe you want to search "linux won't recognize wireless keyboard".
It's very easy to think of instances where this will be helpful.
