Drinking the Node.js Kool-Aid

On Erlang, yes, though by no means extensive. Most of it was messing around in Rabbitmq-land.

Yes, you can still do 'bad things' (tm) and wedge the process, its not coroutines, though even if it was you can wedge those too.

Everything in the base libraries and the modules most people are writing though are async/callback based -- so its 'hard' to do something blocking on accident, so the need to farm things out with deferToThread like in Twisted is greatly diminished.