The person who merely likes to be organized prefers organization, but he or she would be able to handle disarray and not let it interfere with his or her life. The person with OCD, on the other hand, would not be able to tolerate disarray. This person would have a difficult time accomplishing anything else because of the fact that things were unorganized, and he would want to compulsively organize everything to get rid of his obsessive thoughts about disorganization.
There is nothing wrong with liking organization, and we often hear of people who like organization being called OCD. However, this is usually meant to tease people instead of being an actual diagnosis. There is nothing wrong with having preferences, as long as they do not interfere with your life or as long as you can accept that at times you will not be able to do things the way you prefer to do them. If you cannot accept that, and it would lead to great difficulties, then a diagnosis of OCD may be warranted.