I'm a Patriots season ticket holder as well (33 years) and wasn't aware of that offer. Not sure whether I would've pulled the trigger but you made the right choice for a unique experience. Was getting there and parking any different than usual?
I was fortunate enough to have a high school friend who lives in the neighborhood behind the stadium. So I parked at her place and walked (30 min) to the stadium. I walked back to my friend's house and watched the Argentina game with her family. By the time I left there was zero traffic (but I had the added advantage of not going on Route 1 and being able to leave well after the crowd surge).
I did noticed LONG lines to get to the train. I can't imagine that was a fun experience for those taking the train.
But as you alluded, the World Cup is such a unique experience in which most fans are just 'generally happen' and are willing to accept some of the 'headaches' (like crowds, waiting for the train) as part of the process.
I've never been to an international soccer game, so seeing the passion and energy that these fans bring (not to mention just the aura from it being a 'full house') definitely added to the overall atmosphere.
And yes, I realize I was extremely lucky....
1.) Turned out to be great weather
2.) Didn't have to pay an arm and a leg (due to Revs offer)
3.) Got to witness 5 goals in the game (including 2 from Haaland)
So I realize I was extremely fortunate, but with the energy these crowds bring, I'm sure even the scoreless England-Ghana game would have been a great time. Definitely a cool experience that I'm glad I took advantage of.