You definitely don't need to oil it after every use. The main reason for applying oil is to keep it from rusting while it sits. If you just use it at least once a week then that rust isn't a concern. Even if it did rust you can just scrub the rust off before you use it.

There is all sorts of special care you can do to cast iron if you really get into it. But if you really don't care then you can just use it and wash it exactly like any other pan without issue. The whole soap thing is a myth now a days because modern soaps don't contain lye anymore. Soap is entirely unnecessary in cast iron but it won't hurt it. Seasoning is adequately acheived just by actually cooking with it. You really don't need any special process to season it unless you deliberately stripped off all the old seasoning. You can cook acidic foods in it without issue. I do tomato sauce in mine all the time.

Coated pans require way more care. At least I can use proper metal utensils in my cast iron.