I used to just watch the Packers game, and then Redzone either before or after, depending when it kicked off. And like you, it was pure me-time to try and dampen the impending Monday blues.
But I took my gf to the Jets/Falcons game in London last year, worried she was going to hate it and be bored for 3+ hours, but she loved it and now she's super into it. She's picked the Eagles (which may or may not be 100% It's Always Sunny in Philadelphia related) and we watch the Packers and Eagles games every weekend. If they clash, we set one up on the laptop. Basically every Sunday night is a mini-super bowl party. Just a hideously unhealthy platter of snacks, drinks and whatnot, every week (WFH on Mondays definitely helps). She's even watching Eagles pre-season games, full length, which even I don't do. That seems pretty hardcore. None of my friends are into the NFL so it's been pretty great since she got on board.
United is enough me-time anyway, as I can sulk, grumble and hate myself for the most part without interruption.