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Not been but going soon. The brochure has a Eurostar package costing around 120GBP per person more than the standard one (no travel included). Leaves London at 9.27 gets to the door at 13:29. Back 19:37 - 21:39. You save about £30 per person by going for the ferry option.
So if you just want to go to Disney - I'd take the train, however, if you want to spend more time in Paris / buy loads of booze etc. take the car.