[stult]

Not OP but one use case is charitable grants. I made an app for a homeless agency my girlfriend used to work at for automatically filling out PDFs. They spent an inordinate amount of time filling out grant application PDFs, most of which requested essentially the same info. We made a simple WPF app that let them tag each field on the PDF as a particular info type (e.g. address, or address line 1, or statement of organization's purpose) then click a button to autofill. They keep all the data in a single underlying spreadsheet for convenience and just update that, rather than treating each of their hundreds of applications as bespoke.

Also I work at an accounting firm and we have a home grown solution that does precisely this for all of the standard IRS forms we fill out. For a larger firm like mine, we can afford to have someone code the solution in house, but for smaller firms or for in-house accounting departments, this could be worthwhile, depending on the price point.