I’ve used them to map dollhouses, and to create level maps for computer games, for population models, economic models, experience models, for military simulation scenario data, to make maps of game worlds I was exploring, to translate data files and bank statements, and to read and process various sorts of CSV files. Well, actually, I stopped using Excel itself a long time ago, around the time Microsoft started using symbols rather than text for controls in MS Office, and when they started wanting you to subscribe to Office. I have used Open Office or Libre Office instead.