For me, what I actually miss is being able to have something to judge my performance against. Not my overall position on the weekly email (although that has its own value), but the arcane calculation that is the age adjusted performance and how it varies from run to run.
Then I discovered that Running Heroes has a weekly 5k challenge. OK, so it's on a Sunday rather than a Saturday, but it gives you a leader board and age tables and all of those little things that turn a run into a "non-competitive" competition. It's not really the same, but it is nice to feel that you are part of group, doing something we all "enjoy" and providing something a little more than just comparing our own performance run after run.
If that kind of thing appeals, it might be worth checking it out while we're all waiting for the real thing to start again. If it's not your thing, then just keep getting out there and running anyway.