I'm certainly not trying to argue here, but I just don't remember this being the case. Most of the time, excluding specific injuries, the Packer's seemed to operate by routine substitutions and breathers, not resting many players much of the 4th quarter. I didn't notice much difference from any other team. I can buy the last game of the season being an exception. Jennings was injured, Rodger's sat out. But Tramon, Bishop, Burnett, Shields, Hawk, Pickett, Raji, Walden, Nelson, Finley, Kuhn, Grant, Peprah, etc. all still played a decent amount. We just seem to remember different things I suppose. The Packer's only won 4 games by a 3-4 score margin (Broncos, Rams, Vikings once, and Raider's). Despite their impressive 15-1 regular season record, several games were pretty close.
EDIT: Can anyone provide me with a link to statistics of how many snaps each player played? That could shed a little light on the situation. I have look around briefly, but my searches haven't been very fruitful so far.