Hi Bob,
Hope this is gonna help, but myself, the wife and My 2 year old son have just booked our 3rd trip for May.
I've looked at trains from Newcastle to London, then eurostar and just found it a no go. It's just as easy to fly with easyjet. My flights just cost £204 return from NCL to CDG.
From the other end I've looked into getting the TGV but countless people have told me although slightly cheaper and faster, it's a bit of a hassle, especially with baggage.
We've always got the VEA shuttle. Easyjet fly into T2 and CDG, when you pick up your baggage walk out of the terminal and turn left. Keep walking and you'll see the bus stop.
It is very easy to find and very convienient too. Rember when you get off the TGV at the other end you will also have to walk to your hotel, or take a Disney bus. The VEA will drop you right at the door (presuming your staying on propety that is)
Hope it helps