Well, I've done it; in writing my third novel I've found that (due to time-constraints imposed by my hourly job) I need to organize The Key of Living Fire in order to get it done and keep the plot-line amazing. So far the novel is around 53,000-words. I'm hoping for between 115 and 130k in the final manuscript.
The problem I ran into was the plot twists multiplied and I couldn't keep track of them all, or, rather, I was close to forgetting key elements as I wrote new material. The outline I'm forming is almost 2,000-words, which seems rather lengthy to me. The story is growing into something I will be proud of and I think the outlining is proving to be an indispensible tool.
Perhaps I'm turning into an Outliner? (-: