Setting up a couple of spreadsheets at my job has basically been the entire grounds for me receiving bonuses last year, and it looks to be the same this year too. I don't even know that much, I just Google "excel xlookup" or whatever half the time, but people think it's black magic.
My main one last year turned a 30 minute daily task into something it do once a week in about 10 minutes on a busy week, and just print off the daily sheet each night to post. This year, I just added drop-down menus and some conditional checks to someone else's sheet.
I'm just amazed nobody else did this before, because I was sick of doing the old way everyday after my first week.