Experts are people who know their subjects in great detail. Experts get more done in less time in their particular area of expertise because their experience, their knowledge and their intuition lets them make decisions and take the most appropriate action at just the right time.
Often, these experts can't even explain why they make the decisions that they do - it has become almost innate - a second nature. They "know" the right answer, the next move, the right action long before the rest of us do. Of course if you take an expert in say gum disease and ask him or her to make quick, snap decisions about polo for example, you'll find that expertise in one field doesn't carry over to another field, necessarily.
To be more productive in what we do at work, at home or elsewhere, try to become an expert. This does not mean you have to have a PhD or completed some advanced course of study of the areas you are trying to improve - it just means you need to practice and get more experience. If you want to be a better public speaker, work out in front of a mirror, then practice your speeches and listen to them or tape yourself and watch yourself presenting. Offer to open any meeting the team or company will hold. Experts get to their level by consistent practice, repetition and hard work. A person does not become an expert project manager, team leader or even programmer simply by wishing it was so.
Most people complain about meetings. I think everyone believes that meetings are poorly managed. Become the person who others turn to to run their meetings. Build meeting management expertise. Or, focus on a particular process. How do checks get cut in your organization? What are the underlying business rules? Where can things go wrong in the process? If you know that process inside and out, you're the expert.
A benefit that you'll get from becoming more "expert" at the things you do is that you will become more adept at them, sort of like learning the piano or another musical instrument. At first the notes did not come out just right, but with practice they got better and better. We practice and participate in so many fields - sports, hobbies,dating, etc that most people are probably experts in several different fields. Yet do you ever take the time to "work out" on the areas of your job that may not be as strong as you'd like them to be? Do you practice to get better at the things you do? Do you take additional courses or avail yourself of opportunities to stretch your skills?
In the long run, becoming an expert at something will mean you've mastered it, and people in the company you work for will turn to you as the expert. This adds credibility for you and opens doors to tackle new opportunities. However, just because you've become supremely expert in one field, that doesn't mean you should stop learning and mastering other processes or bits of knowledge that will make you, and your team, more productive.