I cooked only with cast iron for years. I loved them. But in the last few years, I cannot even lift my smallest cast iron skillets. I got rid of them all. I ended up buying a set of nonstick ones from Amazon. I use the smallest one for eggs. When I cook with them, I learned you do not want to heat them up too hot, especially when cooking eggs. Julia Child always said to cook eggs on lower temps.
Do not use anything metal! Use wood, plastic or the new fangled silicone things only. Lastly, do not immediately pour water in the hot pan. Let it cool and even if it has egg still in it. Let it cool. Then wash it. Most of the time, I just wipe my pan with a paper towel without even washing it. All those years of cooking with cast iron, I guess.