I am on a 4 and so for the update to iOS 6 has been good for speed on my phone. The apple maps app is just about as useful to me as the old maps app. You still cannot really use it as a navigation app. The old app you had click "next" to move through the turn by turn and on the new one it is a swipe. So for me both are A novelty. I will just stick with MotionX or Waze until i can get the 5.
The JB tweaks I miss the most are Folder Enhancer, Pandora SkipHack and BiteSMS