The 3D Gantt, resulting of the 3D WBS, allows first of all to identify graphically the importance of the project interfaces by evaluating the distance between the tasks, but it allows also to display a 3D time-location diagram, as shown below, in the case of a linear project...
http://3d-wbs.blogspot.fr/2012/12/part-56-3d-time-location-diagram.html [1]
Best regards, Jean-Yves Moine