The annual passports are amazing value if you plan on going to Disneyland more than once a year. For example a 4 day park ticket is currently £137 on the Disneyland website and so two of the three passports are cheaper than a 4 day ticket!
There are three types of passports:
Francilien €119 (£97.75)
Fantasy €159 (£130.61)
Dream €199 (£163.48 )
The discounts vary for each and the main difference is that the first two (Francilien and Fantasy) have “blockout dates” (certain dates of the year you are not allowed in) The best one (Dream) has year round access as well as the following discounts and benefits:
After-Hours Parties -30%
Disney Hotels -35%
Family discount -20%
1 Day Park Tickets -20%
Buffalo Bill's Wild West Show -20%
Extra Magic Hours - Included
Golf Disneyland Paris on green fees, restaurant and boutique-10%
all Disney Stores in France-10%
Rainforest Cafe, King Ludwig's Castle, Starbucks Coffee and McDonald's in Disney Village-10%
Free apéritif at Table Service restaurants
Free use once each day of Stroller & Wheelchair Rental, Pet Care Kennels and park Luggage Storage
If you plan on staying in an actual Disney hotel you will almost certainly get tickets with your hotel and so a passport is not needed. It is also worth keeping in mind that the cheapest passport (Francilien) does not allow entry for the two days after you have bought it.
If you want the info on the discounts for the other two parks then check this website: http://www.dlrpmagic.com/planning/booking/annual-passports
Buying these passports is easy but can take some time. Firstly you must buy them at the Disneyland park entrance where you will receive a temporary access to the park, and then sometime during your day you must go to the “Bureau Passeport Annuel” and have your photo taken and card made for you. (Expect this to take up to an hour at busy times!)
If you have any questions I will do my best to answer.