I love Workflowy and use it all the time for brainstorming new ideas or cleaning up and refreshing older ideas. Workflowy creates lists fast and helps me structure quick or longer thoughts in a way that it helps me organize my brain. Apps with the goal to help you brainstorm above all need to be fast. And that Workflow is.
Here’s one little feature request I have though: I need some space. Breathing room of you will, between the lists I’m creating. Currently every line is a list item and starts with a bullet. I wish I could create a line, after I hit return, that would create a completely empty line. This would allow me to separate my list elements a bit more and the breathing room would allow for more visual separation, thus making it easier to find beginnings and ends to thoughts.