I've noticed that sometimes you can go to a restaurant, order two different meals and then one comes out at a "normal" size and the other is huge - I think it's the luck of the draw in what you pick (and it's usually my meal that is huge ).

Some of my personal favourite restaurants include Pizzeria Uno/Chicago Steakhouse (the starters are usually pretty big), Bennigans (an Irish Steakhouse which does a huge deep fried sandwich) and IHOP (lots of choice and so reasonable, you can add extras and still pay a good price). Also, for Seafood try Shells (down to earth with good food and very reasonable) or for something a bit different go to Bahama Breeze (Caribbean style).