Languages with lots of words for snow tend to be used places where there is lots of snow to talk about. Languages with few words for snow tend to be used in places that don't get much snow and thus don't need to talk about it.

In short, if you need to talk about any subject learn the local language (whatever that is) so you can talk to the locals about the topic.

Having recently listened to John McWhorter's lectures on the history of human language, I was surprised to find out that there is no reliable evidence for the Sapir-Whorf hypothesis (that language affects thought). The Wikipedia article on linguistic relativism states:

> The strongest form of the theory is linguistic determinism, which holds that language entirely determines the range of cognitive processes. The hypothesis of linguistic determinism is now generally agreed to be false.

English includes a lot more words than most people use regularly. I imagine that's the same in any language. Just expanding one's working vocabulary in one's native language would probably be quite helpful for thinking and expressing oneself more fluently—not that learning another language isn't valuable.