The Rapture is what Evangelical Christians call the time when they expect that everyone who is saved will go straight to heaven, mid day, without passing go or collecting their $200. This leaves the rest of the world with problems such as how to deal with suddenly driverless busses filled with non-believers.
I agree that the phrase Rapture is clearly non-Witness speak, and is as out of place there as pork ribs at a Bar Mitzpha.