You can even create rules of engagement about individual behavior. Or, the senior people in the meeting can speak only after the junior people have had a chance to express themselves. It's a pretty simple idea, really. All you are trying to do is to make the invisible visible, to make the automatic deliberate. Such rules of engagement give people a chance to design how they treat one another in meetings.
Decisions are the Valium of meetings.
They offer relief from the tension of what lies ahead, from the uncertainty of the world. Now we don't have to worry about that issue anymore. Often it takes courage for a group to end a meeting without making a decision. There is a legitimate social component to meetings. Sure, we'd all rather be efficient than sloppy in our work.