Outlines vs. No outlines

I'm actually thinking of using an outline to guide the next story I write. I used to be so opposed to it, but after doing it for the Zara sequel, I've found it to be really helpful. Of course, in that situation, I wrote a rough draft first and then fixed it in outline form first before beginning to write it. But other writers, I know, have to submit outlines before they can get acceptance on a book. So writing a synopsis first would probably be a good skill to have.

Anybody else out there a newly-converted outliner? Does it really work better than not outlining?