hi ,we did this last march and found that the drive ws pretty straight forward,we used my tomtom with france map and the route it took us was fine,a bit hairy around paris so just be a bit more on your toes on that bit if you go the same way as us ,there was 2 toll sections ,1 where you just take a ticket and the next one wher you paid,i just put my debit card in as i ahd all the money ready(i can`t quite remember how much but the figure of 18 euros comes to mind)and then realised i was at the booth for cards which was actually easier !!
we found the route took us about 3 hrs and be warned -when you drive off the eurotunnel it takes you straight onto the motorway ,davy crockett was easy to find and the drive from ther to the parks was really quick ,
have a great time -as a useful online route we used viamichelin for looking up the route before ,i`m sure it tells you the toll prices on there
liz