Worked for a company whose automated options trading system was an.... excel spreadsheet. Every now and then I would need to RDP to a machine to RDP into another machine to restart it. Pain. So much pain.
It would take a 1 year project and 5 devs to replace what one finance person created in a day.
Then when it didnt work complain the SME got the requirements wrong.
Im being silly but as a dev i hate the hate for excel, though i know from years of experience that its also a nightmare.