The 45° “bird’s eye” imagery was a feature that Bing had first, but Google has been adding it gradually (including at Cupertino where you linked). If you enable

The 45° “bird’s eye” imagery was a feature that Bing had first, but Google has been adding it gradually (including at Cupertino where you linked). If you enable the MapsGL experiment, the Google version also uses 3D buildings to rotate very smoothly compared to Bing.