Here's the thing....
In Atlanta at times the "Breezeway" line is LONGER then the regular line. And they folks in the Breezeway seem to be fairly rude to the agents if they don't clear that line.
Maybe in cities with FEWER Medallions this is a great perk. If your city is "Delta" heavy then during peak business travel times is this really a perk? If EVERYONE is in the Breezeway line what did you accomplish? You moved from one line to another, but this one is "Special" LOL!!!! (Nashville would have worked the same way, even when I was platnium flying on full fare out of there it could be hard to "upgrade" because half the plane was also in the same situation on a Monday morning!!!)
Plus it's not like folks are waiting until zone 9 to board... What I see is that the "Breezeway" is being used during Zones 1 and 2 to cut off your fellow Mediallions and First Class because "I'm special" So the whining on here isn't what seems to be really happening.
IMHO we Delta flyers are equal to SW LOL! I watched my flight to Kansas City last week. The First Class guys were literally standing in the Breezeway line 20 minutes before the plane started boarding. (Exactly WHO they were beating on board is questionable?) This was for one of the Comair jets with First Class so "overhead" space wasn't an issue, you were going to gate check. Comair doesn't serve booze on the ground so you weren't going to get an extra drink... WHAT WAS THE RUSH? I swear Delta has become the new SW. SW dealt with the "line up" an hour before the plane issue, but you still see it with Delta. I waited until Zone 1 was called, got on in the only open line (which for reasons Comair understands was the Breezeway LOL!) checked my bag and took my seat. No real difference between that and the expereince of standing there for what turned out to be 45 minutes (we were delayed) to make sure I was "first" on the plane.