I prepare close to 100% of my food from scratch, though not for health reasons, I just enjoy cooking. If you're cooking for taste, I find myself adding sugar/honey to compensate for produce not being up to snuff (hard with supermarket produce sometimes) with some frequency (maybe a couple times a week.) Most often I'm adding sugar to fix sauces made from fresh produce that turn out bitter or sour just because of the produce.

I can't imagine most packaged food companies are using amazing produce. I would bet that most packaged meals would taste terrible without some added sugar.