SharePoint is used in my company in three different ways. We first started using SharePoint in order to create a Business Intelligence Portal, through the use of this portal we display Scorecards and KPIs that assist management in making educated decisions as to which indicators are doing well and which ones need to be reviewed.
Another way that we use SharePoint is to create applications with the assistance of InfoPath, Nintex (workflows) and SQL Reporting Services (reports). Our Capital Budget has been done through the last three years through one of these applications.
Finally we have also created collaboration sites for the different internal departments that allows them to share information and documents with each other.