There are two personality types that are especially useful to an organization: the dreamer and the doer.
The dreamer is the big-picture person that generates new, innovative ideas. This person is valuable because they are at the cutting-edge of innovation. They will take old ideas and synthesize them with new ideas. They create synergy.
Unfortunately, dreamers have a serious flaw... they are not adept at implementation. They will develop an idea, but do not have the attention span to follow through and effectively implement the idea.
This is where the doer steps in. Doers are people that love detail. These are the people that get things done. They are the planners and list-makers.
The doers have a serious flaw, also. Their attention to detail prevents them from seeing the big picture, which makes them ill-suited for developing new ideas.
Fill your organization with equal numbers of both types and your organization will flourish. The dreamers will develop the framework for innovative ideas; the doers will take care of implementation.