July Aug & Sep is the peak vacation time in Paris. Everywhere there will be a huge queue standing in all places.

Disney Land will take one full day to enjoy every ride.
Time will mostly go in standing in the queue for each ride.
You have to stand a lot.
If you are taking ur kids, dont forget to take the stroller for them
Go for the ride selectively and enjoy the vacation.
My favorite in Disney land is Hollywood Tower of Terror

Walt Disney is just opposite to Disney Land.
It will take another day to see the complete ride.

So plan it according to your time line.

If you want to spend one day for both, just put half day for Disney Land and the another half for Walt Disney.

There is also something called Fast Lane in each ride, where you can get the pass for it.

Metro train stop also there for disney land.

You have to stand and walk a lot, so take rest whenever possible.