To Outline or to Not Outline? That is the Question

When I was in undergrad, my film classes always made us outline our scripts on notecards. While it was helpful, I always changed it up so much that I eventually did away with the outline and just wrote whatever felt right. Now that I have decided to give this whole writing professionally thing one more time, I find that my approach has changed. 

Now I utilize outlines; even for short stories. Although I still change them up every now and them, I never fully appreciated the focus that they give me when I write. Will I use them all the time? Probably not, but it sure does appear to be helping me get my butt in gear. 

Do you outline your stories before writing?