The threat is so significant Abrams thinks P2P programs should be avoided. “Peer-to-peer file-sharing programs have virtually no place in a business environment,” he says. “The security of the programs varies widely. However, in many cases, the default settings are not the most secure. The risks of P2P file-sharing are too great to be ignored.”
I am not sure how prevalent P2P is in corporations, but I would imagine there is a subset of people who use it for illegal downloads at work. This however is the first I have heard of using it for sharing large files, at my company we use HTTP services on our web server to share files larger than 10mb.