I've been looking at this for a while, and it looks like its just animated paths (correct me if i'm wrong), but I'm wondering if there's any trick, workflow or script/plug in that makes this awesome animation easier or less tedious than just animating the paths and masking elements.
EZ way - Cartoon shader in a 3D app.
Hard way - Draw every frame. You'll need about 15 drawings for this gif.
it's probably all After Effects and clever use of Shape layers and of course knowledge in principles of animation, a lot of talent and timing.
start here with Emanuele Colombo:
other names worth mentioning:
you can go a long way with 2d and using Rigs.