Some days ago I rediscovered vvvv. I had seen it when i started using processing, but it seemed at first relatively hard to understand. And since my idea was to code audioreactive applications, processing was clearly dedicated to that ( and at least processing is multiplatform, vvvv only runs on windows).
However, I rediscovered vvvv. I was looking for a way to load animated 3d objects in processing and found that vvvv can load natively .x files ( directx ). That format handle animations, textures,...

There is a huge list of nodes, each one having diffenrents inputs and outputs. But the good thing is that to create standard application I use 20 or less different kinds of nodes. And even if you don't understand a node, there is a nice help exemple for nearly each of them. The trick is to create and select it, then press F1.
I have used vvvv for some weeks now. I can tell that prototyping is much faster with vvvv than processing. There is no need of writing a single line of code! I'm really wondering if I will use processing again.