I have not kept pace with this thread so am just reporting.
Last Thursday I flew D1 FCO-ATL-OKC. We arrived at F but my connecting flight was out of B.
I should have stayed at F as B had a line where the wait was at least 20 minutes. My boss, who was flying domestic, was at the head of the line and anxious to talk to me. I went to the rear of the line curled around the corner and eventually got a few minutes with him.
I remember the days of BE(prior to D1 name change) when we had BE dedicated lounges at ATL. But having flown 11.5 hours from FCO and then waiting in line is more than a disappointment. I wonder what it will be like on my return flight from ICN.