First....WELCOME Cuz!!!
I think alot of it is the fact that Green Bay pretty much LIVES for the Packers. There are no "broadway" shows or things, no other big time sports like MLB or NBA there. It's a small place with a BIG league club. Plus there's no greedy owner, it's locally owned by the community.
I was lucky enough to see BF's last win, the "snow bowl" playoff game against Seattle at Lambeau, and it was a magical feeling being there, the snow flakes bigger then i have ever seen, and NO wind. It was like being in a giant "snow globe". I doubt i will EVER see that kind of game again. At the beginning of the game, it was clear, NO snow. By the 3rd quarter, it was incredible.