It is true that when you write something, you are so immersed in it that you can't see that what you have written doesn't exactly match what is in your mind. You also can't see when you have put too of's next to each other, or said the same thing too many times, or used words or phrases that only a handful of people would understand.
I am so grateful that there is somebody willing to look at my writing, carefully and lovingly point out my faults and errors and then hand the book back to me in an improved state. It reminds me, I don't know why, of that movie where Anthony Quinn plays an Eskimo (in the days when that word was okay and Spaniards could play Eskimos) and he talked about sharing his wife with a stranger, which was apparently the rule back then. He said that if his wife had a bad time, she came back happily to him and if she had had a good time, she came back gratefully to him. Win-win I reckon. I don't know exactly what that has to do with appreciating my editor, but that's what I remembered.
So here's to all editors, those generally unsung people who make authors look better than they really are. Best wishes!