While DL may be last among majors, the only time I've had to wait more than a few minutes in the last two years was last month in MSP.

A guy in front of me in the medallion line wanted to revise his entire itinerary standing at the counter. After about eight or nine minutes of waiting, one of the non-elite counter agents started taking medallion flyers instead.

Maybe it's not how many people, but how you use them that provide service.