Going 3D
Of course D&D is a three dimensional world, many campaigns include even more facets and planes of existence as well, however at the table a lot of that depth disappears when using minis on top of a map/graph/board or whatever 2 dimensional surface most of us use. While it may be as vivid and engrossing as an imax movie in your own imagination, some players may not have such creativity in them. No matter your level of imagination, I think we can all agree that seeing a 3 dimensional representation of your environment can be pretty damn cool. Along with the aesthetics it forces us to think in 3D when it comes to blasts and bursts as well as range and many other mechanics become more interesting.