The way Poser morphs characters also, with parameter-driven dials, and other connected features, is also parametric and generative.  That's kind of how some of those designs are modeled in Grasshopper for Rhino, and 3dsmax, etc. too.  It's similar to building complex shaders in the Material room, as I mentioned, but with geometry, from the ground up.

Obviously, not everything you model would be parametric, and shouldn't be. You don't need it to be.  But if you wanted some highly complex, unique, and very difficult to model structures or whatever, then the parametric technology is really useful.  That's why it's used so much in contemporary architecture, sculputure, jewelry making, and now even clothing design, etc.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.