If I find useful copyleft code I would copy the code to a degree because I read it and cannot forget about it. I do try not to make a simple copy and in most cases it is just a tiny subset of the original, but a case could be made that it is still the same in abstract.

I do think that copyleft should have its place though, it doesn't have to be either/or. Especially in todays world where systems get more and more restrictive, it is a good license to have for some projects and ensures that ideas continue to be shared.