I use spreadsheets at work. Some are simple; some are full of macros, elaborate formulas and multiple sheets. When they work as they should, they're more than handy. When they don't, and need careful scrutiny to determine where the problem is hidden, the final effect may be feeling like my brain has turned to mush.
I think I should wear earplugs this evening. That way my brains won't leak out on the drive home.