2009 - Packers smoke the resting Cardinals. Lose in a shootout a week later.
2010 - Packers win a very ugly game against the Bears to claim a Wild Card spot and then roll to the Super Bowl.
2011 - Packers beat the Lions despite Flynn starting. Get blown up by the Giants a week later.
2012 - Packers lose to the Vikings, then beat the Vikings a week later. The 49ers then run all over them.
2013 - Packers win vs. the Bears in thrilling fashion, and then fall to the 49ers on a game winning FG.
Momentum/confidence is important, but that doesn't mean squat if it doesn't carry over. Just win, get the bye, and get everyone healthy and ready to go. 40-0, 40-35, 10-3, doesn't matter how.
You can look at the recent Super Bowl winners and see their uneven performances in December. The Seahawks last year went 2-2 in December and then turned it on for the playoffs. The Ravens went 1-4 in 2012 but still won the Super Bowl. The Giants did go 3-1 in 2009. The Packers were looking great offensively though they did drop the game vs. the Chiefs. The Saints went 2-3 in 2009 (including resting Brees in the final game).
Etc, so on, and so forth.