I'm sold on JS, as to me PHP is very ugly and incomprehensible. My stack currently looks like this:
Node -> Express+Passport+Mongoose -> Bootstrap + Angular/Polymer + D3
I've only begun my project three weeks ago, but I would have hoped to have a prototype by now. Admittedly, I'm not working on this 40hrs a week, but still. I find it very hard to understand how everything fits together.
And then news like this appear, once or twice a week, which make me spend some hours reading on this or that new framework and how better it performs.
</rant>
[1] I did some flash, html and js about 6-7 years ago. Also learned enough php to be disgusted by it.