That's interesting. I do both city view landscapes (from nature, on site) and life drawing sessions and short portraits and to me the two are so different that I don't feel the skills transfer. And "quick sketches" on the street are different still.
For life drawing, IMO we have super sharp intuition for a face or body being "wrong" in its proportions. And except if you are an american superhero comic book artist we have only a little intuition that shape detail is not quite right. And getting that perfect is seriously hard - that's classical anatomy drawing territory. I pay attention to proportions but I sure don't obsess about modelling except where it "defines" the person - like sharp cheekbones or chin perhaps. And that's not classical anatomy stuff - just the basics. For landscape by constrast for me, it's about being able to abstract it while not making a blatant perspective mistake. And I don't feel that's an intuition problem for most people. More analytic. Anyway :-)