It's all what you're used to reading. If all you've been staring at are various curly-brace languages then of course you're going to prefer that.
I was primarily a curly-brace developer for 10 years, but changed my mind after a few years of Python, Ruby and Lua. Now I actually think these languages look better than the curly-brace family.
For me, the stereotypical CoffeeScript experience applies: Easy to write, hard to read.
async/await is on their roadmap, though I'd estimate about a year before it'll be in a stable version (I wouldn't be surprised if it'll be available on a feature branch much sooner, but with lower expectation of stability).
Btw, based on typescript discussions, they are going to implement async/await functionality too.