We did the Departure Day breakfast with Virgin last year (was 1900 Park Fare brekkie then.) It was great for us because we didn't have transport, so had free travel to GF and then onto DTD. Disadvantage was we were the first to be pick up, so had to be up before the sun!

It was still dark when the transport arrived. However, the transport was awesome - a stretched limo!!!!!
We, and two other families were picked up. All luggage is loaded into the trailer, and it securely locked while you have breakfast, then you are taken to DTD to check-in and away you go. I suppose the other downside to it for us, with no car, was it takes a lifetime to get from DTD to any park and visa versa to get back for transfer. But even so, we managed to get to AK, did EE and Primeval Whirl several times, did some other bits, went back to DTD, did some shopping and still had time to spare before transfer was due!
It was a brilliant way to spend the last day. It is certainly very advantageous for anyone staying off-site with no transportation. When you add the meal and what a cab would have cost, you kind of break even, so not quite sure how someone staying on-site with a car might fair.
Since we are on-site this year, we won't be doing it. We already have 1900 Park Fare brekkie sorted, as well as our last day - DTD for check-in, hop over to TL, stay there all day, eat at Planet Hollywood, and get transfer from DTD to airport.