Keep in mind that "arrival time" means when the airplane's wheels touch the ground. Arrival time does not mean arrival at the gate. After arrival, there is the time to move the plane to the gate, and depending on the arrival runway, the location of the gate, and other ground traffic, this can take some time. On a recent arrival in Madrid the time to the gate was more than 10 minutes (and it seemed like 30...in Hong Kong and Incheon (Seoul), 10 minutes would be fast...but few pilgrims heading to Camino routes go by Hong Kong or Seoul.) And then there is the time to get everyone off the plane. This is typically fairly fast, but sometimes not. Sometimes there is quite a delay in getting the jetway positioned correctly and the door opened.
Charles de Gaulle and other large, busy airports (Heathrow, Madrid, Frankfurt, Singapore, Hong Kong, Incheon, Bangkok) are efficiently run and typically well-signed, but simply because of the size and there being so many travelers, can be confusing and intimidating to those at the airport for the first time.
I certainly see the appeal to fly into CDG and then to Biarritz. Personally, I prefer to fly into CDG, have a hotel in the Montparnasse area of Paris, go there, spend a night, then catch an early-morning train from Gare Montparnasse to Bayonne. Much has been written here on the forum about that.
Buen Camino!
--james--