I'm one of those people who take the bright, shiny trinket that engineers love to show off and, after a few moments, make it start oozing a brown, smelly fluid as I find the flaws.

Another area where people don't dog food anywhere near enough is handicapped accessibility. It's a catch-22 situation where people like me can't write code because their hands or eyes don't work correctly, and those who have the physical ability to write code don't use accessibility tools.