I got the earliest slot available for Christmas Eve last year, and would have been able to pick it up without queuing but the delivery lorry was late, so we all had to wait for it to be unloaded.
It was definitely worth it though. I used the waiting time to shop for the extras I couldn't order in advance and it was quite a friendly atmosphere.
Last year they gave a bottle of wine for early orders - I wonder if they are doing that again this year? We got a lovely bottle of Prosecco last year.