I mostly do but I'll sometimes use olive oil for salad dressings or low temperature sauteing and coconut oil for higher temperature frying. I prefer butter or lard for low / high temperature frying respectively though.

I doubt these sane uses would account for even 20% of amount of vegetable oil people consume these days. And there's nothing terribly wrong with using small amounts of sugar of any kind - it's the ridiculous amounts of it that are the main issue.