German, for example, has no word for "silly", while English has no word for "gemütlichkeit".
Eliminating the overhead is worth any of these sacrifices, though.
Language structures our thoughts. It is claimed that Chinese are better at math because of their language structure. How you express things in a different language will help you more clearly see the concept in your own language. I learned more about English by learning German than I did in all my schooling. It improved my spelling as well because it made me understand the words I was using better.