Yep and just look at all the people using Excel. They're not saying 'oh if only this was a diagramming tool where I could draw lots of lines between boxes instead'.
- trying to use it with data where tables are a poor fit, or
- trying to use it with data that can't be reasonably represented in more than two or three tables
I still use spreadsheets for simple "databases," but I can't think offhand of any time I've a spreadsheet that requires more than two interlinked tables/sheets.