It was very 'of the future' when it opened, especially as it was connected to the South Terminal by a monorail. I used it a fair bit back in the day and if I recall correctly it was only US Transatlantic flights, such as Continental, World, Northwest, People Express etc. The whole ambiance of it being in a circle was a very different experience imo.
The original concept of CDG had multiple 'satellites'.
They were fantastic, especially at the time, both inside and out. Accessed by tunnels with textured walls with the longest travellators that went downhill, flat and then uphill to arrive in the round satellites. I must have used them hundreds of times over the years, so familiar even now. All in all ADP were ahead of the game in the 70's-90's period. Anyone remember the announcement jingle followed by some lovely female spoken french ?