Well, I think we all have our own reasons as to why we cheer for and intensely follow a given team... there's a madness to it and it's taken to another level when you go to the extreme of posting on fan forums (even those not affilliated with your team of choice).
For me, Saturdays and Sundays were always me and my brother watching games with my dad. My dad is the greatest bandwagon fan of all-time and as he's approached 70 and all the BS of the last half decade, he's not as into the game.
We all had a mutual love for hating things related to Texas, thank you SWC days of college football and we loved watching the Steelers beat Dallas. I can't really point to 'the moment' when a 12 year old kid growing up in AR gravitated to the Broncos. They were typically the only option back in the 80s living in a Cowboys market. However it happened, I was hooked and after a few years - they have this fun QB and they're in SBs winning playoff games in grand fashion, albeit losing SBs in grander fashion.
Having gone through all that and going to college and being around fans of all other teams, it just became a thing. Every Sunday, we're watching games and giving guys shit for however their team did that week.
I think that's probably similar with most. Watching the game has either a deep family tie or a deep tie to friends. You watch these guys and you want to be them and some of us just become so addicted to being a fan, we end up following them relentlessly. I mean seriously... why in the hell do any of us park in front of a TV to watch the freaking draft?
As I've gotten older and the kids are more active... things aren't as extreme and I don't follow things like the draft, etc like I once did. However, that 12 year old kid is now a 48 year old father of 3 and there's still a rush with watching your team.
Late in HS and throughout college, I was that annoyingly loud fan that couldn't wait for my team to break the curse and win a title. Thankfully, they did and while I still get frustrated and crazy at times... and will post passive-aggressive antagonistic BS around here
... it's different.
I think a lot of you will be in the same boat very soon. You're going to have that SB winning itch scratched and things will be a bit calmer.
I think age has a lot to do with it too, as we all get older - you mellow out a bit and bullsh that drove us nuts in our late 20's and 30's doesn't mean as much (if anything at all) in our 40s. There's just too many other things going on.
But, at the end of the day - we're dudes (most of us) and becoming fanatical about our teams is what we do. Boards like this are our communal therapy sessions.
I continue to be impressed with those of you that buy season tickets, go the games regularly and buy all the gear... your years of fandom will pay off very soon. In the end, it's an escape from reality...