The Japanese purehabu jūtaku (プレハブ住宅, prefabricated housing) industry is massive and allows quality homes to be built piece by piece in a factory and then assembled on site. The University of Virginia School of Architecture has gone as far as to call the Japanese modular home-building industry "clearly the most sophisticated in the world."
I can't say whether Japanese is the most sophisticated language in the world, but at times it does feel quite modular. It's easy to substitute words in and out of phrases to adjust the meaning of a sentence thanks to the ease with which the language modifies nouns. In particular, words that describe timing and conditions make it easy for speakers to be incredibly precise using very few words.
First we should review how Japanese modifies words. It's actually really simple: Adjectives and verbs attach straight onto nouns. This makes it easy to turn a sentence like Tenki ga yoi (天気が良い, "The weather is good") into yoi tenki (良い天気, good weather). This phrase can then easily be used as the subject of a sentence: Yoi tenki ga suki (良い天気が好き, "I like good weather").