Although arrow functions are nice, they've been around in the form of lambda expressions in C# and other languages for some time, so the initial reaction was more of a "about time" rather than a "wow!" for me. Same goes for generators/yield keyword.
Thanks for pointing out the key difference between arrow functions and inline functions being the context of 'this'. 'this' is going to be a source of confusion for a lot of people.
Yes, a lot of the new features are very "about time" but that doesn't remove the excitement to now have them as a part of JavaScript.
'this' without arrow functions is currently a huge source of confusion. I feel like the arrow functions will help to alleviate a lot of that confusion.
My biggest excitement is that in the past few years JavaScript is now regarded as a first class language, and we're seeing these new versions i.e ES 5,6,7 in a rapid development cycle. I remember being told in the 2000-2002 era that JS was a kiddle language and it was worthless on a resume.
Thanks for pointing out the key difference between arrow functions and inline functions being the context of 'this'. 'this' is going to be a source of confusion for a lot of people.