And what meeting planner isn't? Check out this manifesto on Change This. Called Mind of the Innovator: Taming the Traps of Traditional Thinking, author Matthew May backs up what he's talking about with examples.
One that took me aback was an experiment he did, giving the right answers to an exercise to the lowest status person in each group. Since no one listens to the low man/woman on the totem pole, no group came up with the right answers to the problem. Think about that one. Does this have any relevance to what happens when you're brainstorming answers to a problem you're facing?