I have always enjoyed taking the ferry over to the UK! Much more exciting than the Eurostar. You get a sense of adventure and save one B&B night, that is when the sea is calm, of course.
And, as Septuagent aptly says,
it makes a lot of sense to hop on a ship asap and let the crew do the driving, rather than to hammer all down the length of UK and round London to get to (say) Dover.
This sunset photo was taken on the way over but on the way back, I surprised myself enjoying taking pictures of the industrial landscapes of Hull, when it was more cloudy.
My ferry photos are here.