Often? I dunno, but I’ve certainly caught myself using use case rather more often than I should outside of work. It’s such a slippery term in IT, it’s very easy to overgeneralise.
I get some mileage out of business plan too, mainly as something that institutions all around me don’t seem to have articulated. I think ROI (Return On Investment) has come out my lips once or twice.
From my time in linguistics, etic vs emic distinction was something of a party piece. That one’s harder to trot out in a non-linguist context.
My word of the month has been hegemony; I wish it was work jargon.