People also use something like that to mask a lack of knowledge / experience / understanding / intelligence. Once in a while someone uses big words so well it's poetry, but those people are the exception.
It's interesting to watch how, in a big tech project, a director or architect will occasionally start using a word like "corpus", "idempotent", "assert", etc. and it will trickle down the layers of the team. By the time the keypunch guy is using it, it's gone out of fashion, like last year's suit.