While I am sure there are many ways to create a pie chart... In Illustrator or Photoshop (or even Powerpoint) and bring them into AE... I spent a few minutes just using regular AE plugins (not trapcode or BCC, for example).
Attached is a 3D version of a pie chart. This can be animated.
Take a look at the layers and adjust one setting at a time to see the changes.
While this may not be your answer, but it might be able to guide you into a solution that will work for you.