I got tired of replacing my pans every few years, and so I bought an 8" pan, 2 10" pans, a 12" pan, a 10 " square grill pan, and a round griddle from Lodge. Looking at Dutch ovens now. I use stainless steel + a carbon steel wok for things that won't work in cast iron and a couple of nonstick skillets for eggs and grilled cheese.
My folks use cast iron for cooking and I wanted my own set. I use the grill pan the most, great for when it is too wet outside to grill.
Cornbread is made in the 8", I use the 12" for fried pork chops and searing meats. Did Kenji's pizzas in the 10" pans a few months back, and they were a hit. Also used them to roast buttermilk-marinated chickens for holiday dinners.