There's evidence against strong Sapir-Whorf in the logical-language subculture. They originally wanted people to learn logic by learning Loglan, but today the speakers of Lojban and Toaq are usually either fluent or logical but not both.
The weakest forms of Sapir-Whorf are obviously true, via Zipf's law; being able to shorten long phrases into short nonce words allows for faster communication, which allows for normalization of concepts, in a positive feedback loop. In English, for example, it's no accident that the shortest two words are "a" and "I" and that they are also the most two common ways to refer to things; "u" is on the way there, too!
The weakest forms of Sapir-Whorf are obviously true, via Zipf's law; being able to shorten long phrases into short nonce words allows for faster communication, which allows for normalization of concepts, in a positive feedback loop. In English, for example, it's no accident that the shortest two words are "a" and "I" and that they are also the most two common ways to refer to things; "u" is on the way there, too!