The Norwich playmaker was handed a rare chance to start a competitive game in the absence of the suspended James McCarthy and produced an individual display full of invention and incisive passing.
Skipper Robbie Keane claimed the headlines with a hat-trick on the night he set a new appearance record for his country by winning a 126th cap.
However, Trapattoni was equally pleased with Hoolahan's contribution to a game his side simply had to win.
The Italian said: "He was fantastic, as he was in the last game. He has a good personality, he's creative, but he also pressed as well, which is very important.
"I have said in the past that maybe we ignored him slightly, but at that moment, we had achieved qualification [for Euro 2012] and we were looking at a new group of players.
"Hoolahan is not old, but he's 31 and at that time, we had Darron Gibson, Glenn Whelan, Keith Andrews and other players.
"It was a pity because he has showed us against that he is fantastically creative and one of the best Irish players in this position."