Excel can be used for an incredible number of things and is good aid to make dataprocessing easier and more manageable. It is not always that you need a system. Excel is an incredibly versatile and useful tool that facilitates daily work and provides an overview to users.
If you do not need a large chrome-plated planning and database system, Excel may be what you need. It can give a good overview of the phases of a production or provide an overview of various projects. If you have some projects you need to get a better overview of, you might want to set up an Excel document to help you.
Excel can also be used to provide an overview of data imported from other systems, which is then to be used for further processing.