Actually, it really sucks when it doesn't work.

GA made an announcement to board 1st class and I was 1st in line right next to the scanner on the non-breezeway line. Many other 1st class passengers were lining up behind me. As she turned the scanner on, some passenger started to line up on the breezeway line. After noticing this, GA made an announcement that all 1st class passengers must line up through breezeway

So I went from being 1st in line to pretty much last in line and did not have space to put my carry-on.

My breezeway experience sucked big time!