The documentation was easy enough for me as an amateur developer, but I also have experience with other Javascript frameworks such Flash/AS3 so it wasn't too difficult once you get over that initial learning curve (which isn’t bad).
It's very simple syntax-wise - all my code looked like this! Easy peasy lemon squeezy :)The ability to use multiple canvases at one time using createJS allows us more flexibility in how we can build our site without having loads of different files just because they're separate pages / sections etc within them selves. This has made development much easier since everything fits into 1 file now instead of several smaller ones previously required.