Yeah I think unless there is a race that warrant the entire length of Ghost I don't get why SD wouldn't be a better choice for just training. They also can get quick laps on the T-Bar. But we all know how much sway the racing community has so...
From what I saw, many of the racers still use the T cutting over from Ghost on Muddler. So, they aren't contributing to lines at the chair, but they are taking up the mountains most expansive cruising trail.
The other benefit to Silver Doctor is it's completely segregated. When they cut off ghost, you lose the lower entrances to Governor and Parmachee