I don't think the recovery from an ear crop is any more painful than the recovery from a spay/neuter procedure. I've seen cropped puppies, they bang their little cone-heads against everything without even a whimper. When my dog had a hernia corrected, he cried every time he got up. And the incision for that wasn't even as big as a spay.
I don't think the procedure itself is as painful as people make it sound. It's the fact that it's cosmetic (in most cases, let's face it, it is. What's the point of cropping, say, a Great Dane's ears in that long show crop? Certainly not function, but appearance.) that they don't like.
If it is done properly and humanely by a skilled vet, I do not see the need to fight it. There are so many other, far more serious dog-related issues for me to spend my time on. Why harrass the responsible owners and breeders who choose to crop, when there are people chopping their dogs' ears off with scissors, and as we saw at the shelter this week, burning kittens with cigarettes. What makes this worth such vehement disapproval, while things like that go virtually unnoticed?