Very, very rarely I plot things out. Redraw the Lines was plotted in my head before I started writing it, but that's because I had been thinking on it for months. I never wrote an outline though as we were just starting to do word wars in chat, and I was banging out 1k+ words every 30 minutes. It did take me months to revise it though, and there were scenes that I think I should have written to flesh out other characters and have a B story. It's the one story that I've written that I feel like I could turn it into an original novel by adding a secondary story and writing for more characters than Neal.
I get bored when I plot things out, and then I don't write the story. That's been my experience, so I try to write shorter stories that don't require outlining.
However, I do almost always know the end of the story before I start. If I know the end, then I can get there in a coherent manner. It's the stories that I start because someone gave me a plot bunny that I really struggle with, and I've rushed some endings to be able to finish and post a story.