I just watched this TED talk from Conrad Wolfram about using computers in math. Have you seen it?
I was watching thinking, "Great! But what about the test when they have to compute? And what about when they get to AP Calc but they can't do the computation they need to solve the problems that they'll have to do on the AP Test?" Wolfram addressed this near the end of his talk, but even he doesn't have a good solution. He's basically saying that we need a complete overhaul of the whole system. Everything needs to change. I can't imagine that'll happen any time soon!