I got to experience a championship when I lived in Chicago for several years when Michael Jordan was on the way up. I wasn't a hardcore basketball fan to begin with, and stopped paying attention as a kid when the Braves left, but it was fun becoming a Bulls fan at that time and I sweated it out in those playoff runs almost as much as I would a Bills playoff run. The excitement at the first Bulls championship was awesome, but still nothing like what it would be if/when the Bills win.
I did win a state championship many years back in racquetball. The relief and joy on winning it was so memorable. Again, nothing like what it would be for the Bills.