Most of the campgrounds in PF have trolley access, but we love Pine Mtn. After staying at most of the campgrounds in/around the area, it has the closest access to the happenings, you are close to Dollywood, but you are back behind a knoll and the sound off the parkway is less. It's location allows you to use some back roads to get back and forth to the places you want to get to without using the "parkway". Traffic in PF and Gatlinburg can be absolutely horrible. When we stayed at Riverside, we sat in traffic for several hours trying to get into PF, but it is a great campground, just not a great location. We have stayed at Smoky Bear, Adventure Bound and Jellystone, but you are about 30 minutes out of Gatlinburg and then another 15-20 into PF, according to traffic. We have stayed in Townsend and in Wallen, but you also have about 45 minutes of drive time to get to PF, if that is your desire.
The sites at Pine Mtn are larger than most of the commercial campgrounds there, but that's not saying a lot. The pools are great and since one of them is indoor, it's useful when the weather is not pleasant outside.
Anyway, that's my opinion.