I have to say that by using cs I learned a lot more about js. Maybe for old js cats it doesnt matter, but I only used js occasionally before, and now it became one of my favorite languages (I use with node, and I write all my node stuff in cs).

One particular example that changed everything for me was the natural and simple way I could build the typical callback constructs with -> and => , so they almost look like blocks in ruby, and feel way more natural as a control construct, and I didnt have to stack lots of })}); and so on.

If you're rather new to something, the ease of use and the simplicity and readability speeden up the learning process extremely.

That being said, there are also a couple of things in cs that are kind of silly.. like using 'for i in my_array', but 'for k of my_dict', and stuff like that, that are really hard to debug.

Although, in terms of debugging, the fact that it gets compiled and possible errors are early detected and a canonical js is generated also saved me lot of time, in particular with IE ;-)