I use mind maps especially when I'm stuck on a problem or am facing writer's block. (The image above is my starter mind map for this post, created in OneNote. Yeah, it's not pretty, but that's okay. OneNote seems to be ideal for mind mapping because even handwriting is searchable, you can embed other files, and if you have a tablet PC, draw on the screen.)
Mind maps will always be my favorite writing tool. Your subconscious mind is triggered by images, so your mind maps help you to become more creative.