The figure below demonstrates the power of the Photoshop CC (2015) Shake Reduction filter. The photo was taken out of a side window ftom a car travelling at freeway speeds. Obviously the trees in the foreground were blurry, but also the mountains in the background were also blurred.
I processed the photo using the default filter settings after repositioning the focus point slightly. The focus point was positioned so it only used the mountains. Doing this did significantly blur and make ghost images on the trees in the foreground. I then masked these out.
From this one, quickly produced example, it is obvious to me that this filter will be a very useful tool.