I was never around for this "culture" people speak of but I have still seen it.
I find another player and it's pretty much instant bond; Unless they're Alliance.
And then it's a different kind of bonding.
It's just not as public anymore and it feels like locally League of Legends took over absolutely everything; And for the worse in my opinion.
(Lock in gaming event? Yes; Let's run a LoL tournament for 5+ hours and have it cancel every other game tournament for the evening.)