Like everyone one of the writers came from Cartoon Network because Disney wanted to up their cartoon game. Seems like it is definitely a smart move that is paying off.
Also, loved this little tidbit about the last episode
"Lance Bass guest starring was a gift from Alex Hirsch to his sister, Ariel Hirsch, who was obsessed with Lance Bass at Mabel's age. He told her, “We’ll get Lance Bass to do a voice and you can meet him,” and made that dream come true for her."
So awesome. And that's the real life Dipper and Mabel pretty much.