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(Belatedly) I have, it's great - it's not really cheap, but when you compare the cost of a hotel room and the fact that you can get there of an evening after work and start your tour the following morning it's totally worth it. IME the onboard breakfast at the Dutch end is far superior to the one in the UK; at about a tenner a head I wouldn't bother getting it unless you were fuelling up for the day's journey, especially as there's a supermarket near the port.
The only annoying thing if training it to Harwich is that you can't take a bike on the rail and sail deal Stena offer, and you have to reserve a bike space on most trains (the express goes Liverpool Street to Braintree - the local service on to Harwich doesn't have reservations, and the conductors are cool with/used to cycle tourists).
Has anyone taken the ferry from Harwich to hook of Holland? Any good? Worth the £50 each way? Seems insane but go off I guess. At least it's overnight and you don't have to dismantle the bike.