It is terrible.
Why one more click?
Why change something that works? Google keep changing things... That don't really matter.
And this 'save a click' argument is just silly. Hover still means you have to target two points.
What's is funny though, the Google-bar at the bottom would at least make sense on a chromebook, but at the top they always suck, because contrary to an OS taskbar, they don't provide an invinite mouse target because of the Tab-bar.
It takes less space, since it also includes the search box.
Cognitive dissonance and lack of visual cues, yes, but not an extra click.