Disneyland Paris is totally accessible for wheelchair users. In April 2014, I visited Disneyland Paris in my motorised wheelchair. I did a lot of research before I went and managed to find out how to get free entry for my caregiver as well as the fast pass which enabled me to go in a special entrance to the majority of rides. Bypassing the queues at the end of the day, I pondered how to get to my hotel because it was further than I had expected. I had thought I would just be able to go along the pavements until I reached the hotel, but the pavement area was very dark and I did not feel confident to do that. However, there was a huge stroke of luck and I found that there was an adapted vehicle just waiting for me and it was going straight to my hotel! Unfortunately, there is very little information about any of this and you have to figure it all out by yourself. I was quite surprised by the lack of awareness exhibited by the staff – they didn't know where I needed to go to get my carers free ticket, as this could only be purchased from one special window, and no one in the park seemed to know about the accessible transport. It was only by sheer chance that we spotted it.
I have not been to the other Disney parks but on wheelchairworld.org you can find a large amount of wheelchair user reviews and resources for all of the Disney parks and even the Disney cruises.
I stayed at the Hipark Serris, a hotel situated in a new area that had dropped curbs everywhere and a shopping mall with various restaurants that all looked to be wheelchair accessible, though I did not investigate. The hotel itself was very nice and it was an apartment rather than a hotel room, with a kitchen/living area, a bedroom, and a separate toilet room and shower room. The toilet room came with the regular European adaptations such as a drop rail by the toilet (side entry possible). The apartment was large so getting around it was easy.
I got to Disneyland Paris on the Eurostar from London. There is a Eurostar station that delivers you right to the Disneyland Park. Wheelchair users get special discounted tickets on the Eurostar. The wheelchair seats are in 1st class but you do not have to pay 1st class prices. There is one price and the price does not fluctuate according to season and demand – the only thing that will reduce your options is the availability of tickets if another wheelchair has already booked the wheelchair space. Because you are traveling in 1st class, you get to use the 1st class lounge and have access to all of the free food, drinks, and magazines they have to offer.