Maptool and ventrilo is our weapon of choice - it allows me to game with two old groups that I would never see otherwise. I can also load macros in for complicated rules (yes - I play D&D ) So when my monster tears the party to pieces with 7 attacks I don't have to sit there looking up all the rules and adding totals. I find it speeds things up a lot - I even ran a face to face game and just had maptool open on my laptop - the players never saw it - because it helps so much.
Also, it's been said before but bears repeating - maptool is entirely system agnostic. So much so that if someone finds they can't do something for their system the developer (trevor) will make sure it gets implemented - often in time for your game.
That's more valuable to me than WotC shiny 3D.