In my opinion, you have two types of landscape photographers:
1.) Those that use filters because they don't know how to use Photoshop.
2.) Those that use Photoshop.
I have never come across anybody that was skilled in Photoshop that would prefer using filters to post-processing.
(I'm assuming this topic is excluding filters that can't be replicated in post. i.e. polarizers, etc)
Well, meet your first PS-knowledgeable photographer who prefers getting shots right in the camera instead of massaging files and pixel pushing.
Your blanket, smug statement ignores the fact that there are some of us who, for health reasons, cannot afford to spend hours sitting in front of a computer. There are also others who, even though they have no back injuries/problems, prefer to spend more time doing other important things, such as family, business, &c., than Photoshop.