For me personally, the separation point between "the dark ages" and what came after was the 1992 game vs. Pittsburgh. In hindsight it was probably the Cincinnati game in week 3, but at the time, I felt a definite shift in my own sense of optimism after a double-digit win over the Steelers in week 4 I believe.
That game vs. Pittsburgh, the Packers just looked like a really solid operation all around. I hadn't felt that way about the Packers since... well, ever. Favre looked good, they looked well coached (they were, we had no idea at the time how many future head coaches were on that staff), the rest of the team looked good, they beat a pretty good team solidly. I remembered thinking after that game that maybe after years of torture that things were turning around. They truly were and man did things get good after that!!!