Not every conversation needs to occur in a conference room. In fact, done well, a hallway conversation can work even better for quickly sharing time sensitive information, flagging a potential issue, or making a simple decision. The key to making a "5 Minute Grab" work is having a very clear purpose and providing only the essential information.
What fuels the energy and excitement that's visible among people who are highly engaged and productive at work? Is it something about what they bring to their careers to begin with? The management culture they experience? Or, are those qualities found mostly among the young, because of youthful energy, as some surveys indicate?