Absolutely. Though, I have yet to come up with a good use for geometry shaders, but I may just lack imagination.
I think the coolest feature of geometry shaders is layered rendering and it has a lot of applications. Layered rendering means rendering to several texture layers (slices of a 3D texture, faces of a cubemap) or viewports at once, that is with only one DrawElements call. The geometry shaders can choose/change the layer or viewport before emitting a new primitive. (BTW the viewport selection is provided by a separate extension)