For the record, there are known to be a variety of “frequency effects” in language. A brief survey:
Zipf's law: roughly speaking, the most frequent word in a corpus will be about twice as frequent as the second most frequent (i.e., twice as many tokens).
Word recognition: Dahan et al (pdf) :“frequency affects the earliest moments of lexical access”
Sentence processing: Lau et al : Frequency effects “give rise to reaction time differences in sentence processing tasks"