I don't think that it's the pressure so much as it was that the team was coming together, and the confidence showed.
They KNEW they were a good team, and that all their 6 losses were by 3 or 4 points. They were in EVERY game, and a bounce here or there, and they could have been undefeated.
They were really good the previous year too, though the defense wasn't as good. The playoff loss against the Cards, Aaron Rodgers was face masked on the last play, and the ball SHOULD have gone back to the Packers. The refs missed an obvious call.
We could have had back to back SB wins.
Guess they will have to do that this season!