I also just bought a cast iron frying pan and it should be delivered today. I'm mainly curious about how good it can cook without having the nonstick layer, which feels dubious considering I am terrible at ensuring I don't use too much heat which would melt the Teflon and presumably poison me. Cast iron with oil/butter may be a bit greasier but hopefully more forgiving given my blunt culinary abilities.
This article is targeting people who want to do a really serious job of creating that non-stick layer - and good for them. But I would forgive you if you were too lazy to follow their instructions (I probably am).
But a rudimentary seasoning is really easy:
Wipe some oil over the pan. Use as [high temp oil] as possible, but whatever you have will work. Wipe off any access with a paper towel. Put it in your oven at 230(C)/450(F) for at least 30 minutes. (careful it will smoke a bit).
I couldn't recommend using it at all without some base layer of seasoning. It's really easy to do and lasts quite a while, even if you don't follow the articles really thorough methodology.
source: me - frying with cast-irons twice a day for 10 years
That will just never happen on new cast iron. Old stuff was machined smooth from the factory, new stuff has a texture on par with sandpaper. Unless you intend to take a dremel tool or whatever to your new cast iron before you begin using it, you're just not going to get a surface comparable to a Teflon pan without years of use to build up a layer of seasoning that smooths out the castings peaks and valleys.
I've got a newish, rough Lodge and a vintage smooth Wagner that I both stripped and reseasoned (with just Canola oil. This flaxseed method is overkill IMO). The Wagner can cook eggs like teflon; the Lodge, even after two years of heavy use is still pretty rough for eggs, its nonstick enough for most other foods.
Cast iron is nice and I prefer it for its properties besides the nonstick abiluty, but for the casual home cook making eggs, Teflon is pretty foolproof.