you can't really "react" to super Dash with special-ks, considering they can neither boost nor roll
if you want to hunt down Dash, Xizor's your guy (V.I, FCS, thrusters; Inertial if you're cheeky or Predator w/sensors + thrusters if you have a bid in your squad)
Yeah but half the power of high PS post maneuver dial movement is that you can see where your opponent is going and counter it. If you get PS on Dash/give the Dash player initiative you can force him to use his boost and barrel roll to try and predict where you're going instead of just seeing that you've pointed your ship's arc left and boosting and barrel rolling right. That's what I hate most about Dash, often no matter how I maneuver my ship he can often just boost and barrel roll out of the arc and still shoot me no matter what. That was the thing I hated most about the pre-nerf phantom.
It's like facing a post nerf Phantom if you have PS on Dash, you know he's locked into one decloak and can't just decloak the other way.