There are two ways to look at the world of work. One says that your job is important, and the other says that it's not. By "job" I mean whatever activities you engage in on a regular basis which require you to perform tasks for which you are paid based upon the time you spent—one way or the other. For all but a fortunate few, this is something you would not do for free, because you do not necessarily enjoy it—being "work" and all.
We spend most of our waking hours engaged in these activities which earn us money to pay for the rest of our lives (the happiness parts). The question is whether our jobs are important or not. Either might be true, depending on your specific case. Without any real thought, it is easy for a person to assume his job is important simply because it is an important source of income for him. Or conversely, it is easy to assume that one's job is unimportant, simply because it does not come with a title or other recognition.
But whether your job is important or not depends greatly on its actual impact. You're either changing the world or you're not. You're either growing a future for yourself and your family, or your digging yourself into a rut. Strangely, these two views pretty much come from the same source. The actual importance of your job will be the long-term decider both for the impact you have on the world for good, and the future you will grow for yourself and your family.
Because we tend to see only what is most readily visible, the "gold bars," corner offices, and other symbols of rank can be used in large organizations to create the illusion of importance. A position might appear important, and everyone might believe it is important...however, consider whether the quality of work done in the position changes anything. If either a virtuoso or a buffoon fills to position, does it change the fate of the organization?
It should be noted that in many corporations (and other organizations of similar structure) that the answer to this question is designed to be a resounding "no!" The old school way of doing business is to assume you're a buffoon until proven otherwise. Therefore, most of the power is placed in central positions like the CEO, et al. In these positions, it matters, but only to the fate of the company. If the company isn't making a great deal of change in the world, than neither is the CEO.
Ultimately, it is important to remember that our jobs are only as important as we make them. Whether or not your company is keeping you down or lifting you up, it is up to you to do important work. If the powers that be don't like what you're doing, then perhaps its not the place for you. Don't marry the job, marry the work.