In my experiences, this is the longest wait. I usually leave at a not-busy hour (and the check-in is quick, and there is no tax booth wait). I don't know if the line always moves so slowly, but many booths are closed when I usually leave. Fortunately, I haven't flown directly to the US from there in years and so I also miss the extra gate check. All the more time I have to spend in the sorry lounges @ EZE.