Wanted to state the main idea first. I definitely agree about one-liners, Perl and APL come to mind.

There are some other aspects to this idea of code economy: correctness and reusability. This definitely depends on the programming language.

In Java(or oop for that matter) you can get correctness but to get reusability you need a whole hierarchy of classes, lots of added code/cost.

In Python you get more reusability out of the box but to get correctness you need to add swaths of unit tests, lots of cost.

In contrast with a functional language such as Haskell you get both with less effort, fp plus a rich type system reduce code enourmosly.