People just have different interests. Some programmers are more interested in data stuctures and algorithms, some in architecture, some in usability and UI design- or any combination of those and other niches. They each require different skills and different ways of thinking about a problem. If you like the low-level nuts and bolts of programming, maybe you don't care as much about how the user thinks, or vice versa. Personally, I fall into the latter camp- I'd much rather design a UI than a complex algorithm. It's just the kind of thing that I find interesting.

People just have different interests. Some programmers are more interested in data stuctures and algorithms, some in architecture, some in usability and UI design- or any combination of those and other niches. They each require different skills and different ways of thinking about a problem. If you like the low-level nuts and bolts of programming, maybe you don't care as much about how the user thinks, or vice versa. 

Personally, I fall into the latter camp- I'd much rather design a UI than a complex algorithm. It's just the kind of thing that I find interesting.