It is the last Thursday of the month in Metro Detroit. Your office lead has been in the same spreadsheet since eight, copying numbers from three systems, fixing formulas someone broke and building the report you need to make decisions. Everyone knows that if she ever leaves, nobody else can do it.
An internal tool gives that work a home. Data flows in from your software on its own, the rules live in the tool instead of in someone's head, and the report builds itself while she works on things only a person can do.
Month end becomes a normal Thursday. Anyone on the team can run the process, you check the numbers on your phone, and that vacation finally gets booked.