Has anyone taken the ferry to tokyo instead of flying? Was it worth it? Is there an extra cost to bring a car?

Considering a slow travel by way of the ferry so I could bring my car to the mainland to drive it on vacation there.

I found the prices seemed similar to flying, but I'm not sure if that includes bringing a car or not. Has anyone taken the ferry before and what did you think of the experience? 44 hours on a ship couldn't be all bad. Read a nice book, watch the waves, eat a few meals and you're there.