I have for 10 years now. I don't bother refrigerating anything, there's absolutely no food that I know if that turns poisonous if left at room temperature for 3 hours before heating and consuming it. People are ridiculous about having to refrigerate everything all the time - I know people who throw food out if it didn't go straight from the fridge to the stove.

I just use tupperware, works fine for casseroles, soup, chili, whatever.