Finding consensus with too many people is the #1 reason I see that big companies have productivity issues. Oh, you have a great idea? Why don't we run it through 5 layers of management and 20 committees that always adjourn before finding a decision.

That's why IMHO you need very small teams with a lot of freedom to decide. Then this small team can find consensus much more quickly. The most effective teams I've worked in were 2-4 people.