When you need to get ideas out of your head, typing is not your best option. Your brain can generate ideas at ~500wpm (words per minute) while your fingers struggle along at a lowly 60-75wpm. It's akin to asking a toddler to jot down minutes of a meeting. It can be done, but there's a better way. Dictation can easily give you a 60-100% raw bump in speed compared to typing. But it gets even better.
Dictation makes brainstorming a more fluid process. Your brain gets more time to think without having to watch over what you've typed or spotting typos. It takes away the hesitation before jotting down an idea. It makes it easier to rephrase for clarity. And it's fun. Of course, all that's true only when dictation accuracy is great. On your Mac, your best bet is Dragon Dictate.
What to do with your hands then? Let them play assist. Scroll, pan & position the cursor where the next idea should go. Fire out keyboard shortcuts in your favorite app. Or, when you're ready for a touch of magic, set up a few voice commands to trigger the powerful features in your app. For example, when dictating in Mindjet, Dragon Dictate can be configured to recognize spoken commands such as "Fit Map to Window", "Balance This Map" and "Focus on This Topic" which may be easier to remember than obscure keyboard shortcuts.
With OS X Mavericks, powerful dictation technology is now available on every Mac. Get started with dictation for free, and if it works out for you, step up to Dragon Dictate for higher speed & accuracy with its ability to understand your specialized vocabulary, and learn from its mistakes in speech recognition.