The thing that rings out for me in this essay: "Once plans were made, I showed up without any further contact to check whether we were, in fact, “still on for tonight,”" I miss that. Used to be that if you made plans to meet someone, they would come to that time and place. Amazing! And the difference is not even limited to your friends and dating. Now we can't even count on regularly scheduled activities to happen as…
Also - you remembered your friends phone numbers (or had a black book).