I agree completely. A toggle between the current "free" camera and the zoomed in camera would be amazing. It's been a standard feature in games that offer both isometric and over the shoulder.
I stopped zooming in about 40 minutes. It just felt awkward to move around. I wouldn't be complaining if they hadn't included verticality and the ability to zoom in over the shoulder. But since they have, it makes sense to make it polished at the very least.