Personally, I think it's pretty hard to make that kind of comparison accurately without having professional experience in both fields. One could also argue that it's as intellectually stimulating as being doctor, but how do we actually know that?

I've cleaned toilets professionally, and I'll say once and for all: writing software, no matter how monotonous or boring, is nothing like cleaning toilets. And I'd be willing to bet that someone trying to make such comparisons has ever had to do that kind of work.