Additionally the reactive programming model Meteor templates and minimongo (Its in-memory DB) use are a real helper to build fast and clean consistent interfaces.
Here at ethereum use Meteor for our Ðapps (and most of our websites too) and and i've build already a list of Meteor Ðapp packages that make building a Ðapp more fun.
Additionally you can search the ethereum github for the meteor keyword
Yes it is, but only the client part and all the tools give more then most other frameworks can offer and there is a simple way to bundle the client part only that gives you simple static files you can simply run, server from any server, or later from swarm.
I wrote a short tutorial that help you get started. So go ahead and checkout the Meteor Ðapp tutorial!