OK, first two places not to bother with (one's a shame because I think it's very good, but they don't do family rooms apparently):
The Hotel attached to Le Matelote in Boulogne. Grrr, wonderful restaurant, supposedly currently the best in town. If dd is still in a travel cot you could ask - ds was just a leetle too big.
The Hotel du Lys (or Lion) et Banniere de France in Laon (that would be between Epernay and Calais). Decor reminiscent of the hotel in Barton Fink, weird proprietors. Looks fine from outside...don't go there. We found Laon quite a depressing place generally actually, despite its fine architecture in the centre.
Not that close to Disney, but easy hour's driving distance I think - L'Auberge de Chaalis at Fontaine-Chaalis near Senlis. Great food, nice couple were running it in 1998, delightful old building. Did not go there with nipper but 99% certain it had high chairs in the dining room. There is a train service to Paris from Senlis station.
Near Calais - the slightly mad and VERY welcoming Augerge du Chateau de Tourelles, at Le Wast. Again, nice locally-grown food, really kind proprietors, not a chateau but a slightly faded manor house 15 mins drive from Calais. Did not see atmospheric rooms in old house but they had super family rooms in their modern annexe (double for us, little single for ds off bathroom, all newly refurbished).
Also not far from Calais and in St Omer, the Hotel le Bretagne. Similar to the Auberge, really - unpretentious but very nice cooking, friendly staff, comfortable room, spotlessly clean. Wee bit corporate as French hotels go, but let's face it, there is not much of a tourist market in that part of Northern France. We liked the centre of St Omer, though - and there is no hassle parking and walking here (COBBLED STREETS alert).
Phew, can't help with any of the others, Claireandrich. Sounds like a nice itinerary!