We have EVERYTHING in Orlando. What kind of things do you like? Sorry for not being able to answer the question, but we get asked this all the time and there are HUNDREDS of restaurants in Orlando and without having any insight as to what you like, it's impossible to answer.
And honestly, if you have your sights set on "not fancy" and Waffle House is one of your options, then I'm not sure I can be much help. Outside of chain restaurants everything we eat at is probably going to be somewhat "fancy" if Waffle House is on your to do list!