well, it all went fine. The Adriatic was a millpond, but the loaders didn't' have any suitable straps, and left us to tie down ourselves. They also crammed us into the back of the bottom deck, which meant we were first on, so dumped our gear in the cabin and got a great view sailing through the Grand Canal. Downside was last off, but we stayed overnight in Igoumenitsa so only had a few hundred metres to go.
Food and drink on board were reasonable prices, 6-7€ for a meal, 2-3€ for a beer. The boat and cabins were clean and comfortable. The boat was about 2 hours late leaving, and 1 hour late arriving, no queues for tickets in Venice to speak of, and not much queuing to get on the boat. There were a few other bikes on board, all road bikes.
I'd do the trip again, it was a great way to get into Albania.