Last trip I flew in CDG from MEL via SIN...and out of Orly to Berlin
I used the train to get to my apartment in Bastille, and it was a breeze. Internal train first, and then main trainline which went into the Metro. Quick chain and then up the stairs 300 m to my apartment.
We found arrival a breeze...and barely broke stride as we flashed our passports to go through and collect our backs with little wait.
My return to Paris was by train after a weeks cycling and we stayed in Montparnasse this time. Near arrival train station from Loire Valley, and also easy to get to Orly. We walked to the Airport Bus from our hotel as was not too far (we could have used the Metro, but was not worth it in our case). Airport Bus from this location was painless, cheap and quite quick.
Orly was efficient as an embarkation airport. We had bought cheap tickets on AirBerlin. Standrad departure lounge area was very good with good food and drink options.