I like how you've put it here:

> Needless to say it's a bit more involved, but I felt more accomplished when I figured out how to cook with it.

The rituals and sense of accomplishment. Teflon is very convenient, when it fails you buy a new one, RVS takes a bit more expertise and cast iron is even more of an adventure, it gets better over time, last many generations. It is different in that it heats very slowly but also stays hot when you put it on the table. Nice for slow dining and/or foods that don't stay warm for long. If the handle is also iron you can put it in the oven. You get to cook different dishes that go from the stove in the oven.

Seasoning cast iron has been rather easy, and you can get preseasoned pans as well. My method is: scrub a new (unseasoned) pan well with hot water and a brillo pad, being sure to thoroughly get into any grooves. This is to remove the wax coating present on some pans and to clean any potential surface rust. From there I preheat my oven to 450°F/230°C with my pan inside, this helps drive off any remaining moisture. Once its to temp I pull the pan out and give it a thin coating of flaxseed oil before putting it in the oven upside down for 30min. I do this 6 times, flipping the pan each time, but really 3-4 times is enough. And any fat is also good, I simply prefer flax because it has the best polymerization, which is a debatable quality. I’m just excessive and cast iron collection is a bit of a hobby. After the initial seasoning all you need to do is store your pans in a thin layer of oil if you won’t use them for long period, but even that isn’t a real problem for properly seasoned pans. I’ve never had a pan I seasoned rust.

As for what you’re missing: nothing for cooking smaller foods, but it is unmatched for baking and frying. I’ve found it to be a lot more capable in keeping oil temps consistent and giving good crusts to pan pizzas and cornbreads. So if deep dish pizzas, breads, seared/fried meats and veggies, and huevos ahogados sound good I’d definitely recommend having at least one 10-12” pan around.