Pardew's men will head into the return next Thursday evening favourites to complete the job and progress to the group stage of the Europa League, but his satisfaction in Athens was twofold.
He said: "We go home with some new experience, and certainly for some of our players because they won't get that time on the ball they had tonight in a Premier League game.
"Sometimes you can be uncomfortable with time, trust me. I have been there as a player, so I know. You pick out the wrong pass and you can lose confidence.
"But tonight, everybody used the ball well. We could have had a little bit more devil in our game, but otherwise I was really happy."
Only James Perch and Papiss Cisse were retained from Saturday's 2-1 victory over Tottenham, and the striker remained on the pitch for 75 minutes as Pardew went in search of a winner after Ryan Taylor had cancelled out Denis Epstein's opener with a stunning free-kick in first-half injury time.
Pardew said: "The most important thing is that we wanted to win the game. I can't protect everybody.
"We tried to restrict (Cisse's) work-rate to protect him - he didn't really close down too much.
"His only brief tonight was to get us a goal, and he had a couple of half-chances and nearly did.
"But 75 minutes was definitely, in my mind, that was him done."
Cisse's exit paved the way for local boy Campbell's arrival at the age of 17 years and 236 days, 64 days younger than Andy Carroll was when he made his bow for the club in Europe.
Pardew said: "It was a great opportunity to put Adam Campbell on the pitch, the youngest player to play for Newcastle.
"I consciously knew that and I wanted him to have that tag because he has got a great future in front of him.
"He's such a lovely lad and a local lad, and it was nice that he had 15 minutes - and had half a chance as well to nick it for us.
"It was a great day for us in a lot of ways because we are going to call upon everybody - League Cup, FA Cup, the squad is all going to play."