Web developers, or at least the folks who just do A->B frontend stuff. Without being elitist, I've done some of it and the only stress I felt mentally was due to the baggage of learning the frameworks and things (I might have used an integer or two but nothing more)
More generally (and less insultingly!), any programmers who mostly work with frameworks, rather than writing solid chunks of their own code.
I had a job building e-commerce websites on top of a framework. Our code was a thin layer invoking and customising the framework. It was difficult work that we charged a lot for, because it required extensive knowledge of the framework (which was badly designed and poorly documented). But it never involved thinking really hard about programming itself.
I would imagine most Rails programmers are in a similar place.
