Damn.
This pretty much sums up my experiences, just replace "Halo" with "Dungeons and Dragons". You never really notice when something like that ends. You just look up one day, and realize you haven't played in a long time, and you don't know when you are going to play again. Online gaming is great and all, but it will never replace sitting around the table with your buddies, munching on Doritos and chips, cracking up when somebody does something funny in the game, hanging out before and after.... I miss that.
A lot.