I am a strong believer in using an outline for *my* work. I see it as a road map, though. Not a pair of handcuffs. I do it for two reasons:
1. It ensures that I have "an end" to work towards. That might end up being "the end" or it might not. Either way, though? It ensures that I don't waste weeks on something that I have no idea how to finish.
2. I work better when I see a "whole" picture. I also work better if I push forward at 200 mph. Having an outline also gives me a place where I can add notes to go back to later, and a context in which to understand them. "Sarena is dancing in 'The Nutcracker'.", "Kyden cares about Sarena because she reminds of his little sister, Lacey.", etc.
My characters have no guilt or shame in telling me that something is not as I thought 300 pages in.

But with the method I've developed for myself, I'm not afraid to let them drag me around the story like a group of toddlers invading the local Toys R Us.