I only ride McMurtry. Never riden anywhere else, McMurtry has 4 trails which are all different and technical levels. I rode the NW (orange) trail today and yes it kicked my hind end. I found some carbohydrates this afternoon and it is all better. Platforms have not been an issue however I wanted a set of the clipless style. I enjoy them very much most of the time then there are times I need to get out to balance or set my feet down (quickly).
I did not ride the race to day. I am kind of like you, slow and out of shape. It would have cost $35 for a t-shirt. The race was on the SE (red).
Where is Turkey Creek? I have considered Roman Nose for a change of pace.