For me the single best feature that stands out in D is the uniform member access using dot.

- Want to access member in a aggregate (class/struct)? Use .

- Want to access member in pointer to an aggregate? Use .

- Want to access member in a module? Use .

- Want to access reference (not free standing)? Use .

This makes switching between different implementations pretty easy. Coupled with UFCS, this is pretty fantastic!