I have just returned from Disneyland Paris. Although it is amazing, I don't know how much a one year old would take from it.
We went to Florida last year when the twin were about 18 months. They enjoyed it but didn't really get it. This year, they were 2 and a half and nearly burst with excitement in Paris. However in saying that, our baby is 7 months and she thoroughly enjoyed the lights, colour and sounds.
Price wise, we bought annual passes, flew from Belfast, stayed in a campsite and hired a car so probably not much help to you.