It works fine but not when the figures are docked because it modifies the figure properties and not the axis ones. Anyway it is a great function. Hopefully it will work also when the figure are docked.
I had a colorbar addded to my figure of multiple subplots. The annoying thing was that the exponent of the colorbar was cut-off on the edge of the figure. Using tightfig fixed this for me so that the exponent would fit in the figure. Very useful!