Do Six Flags and KD employees call their uniforms "costumes?" If they do, then my point is made.
Also, I personally don't think the park is sliding away from attention to detail. I'm there all the time and notice and appreciate all of the small things that I'm sure many don't. Also, the employees there have a special place in the hearts of my family for personal reasons. We don't have any family members or friends who work there, but consider many of them to be good friends to our family. I don't care what color polo shirt they're wearing on a given day. It's their spirit and attitude that make our BG experience special.
(Oh, and a friend of mine use to manage the Hooter's in Baltimore, so I practically lived there at the time. I'm going to say from personal experience, I would advise against referring to the girls as "performers"

)