I've lived in EK for 5 yrs now, and have biked the trail from Calderwood to the main part of the park and back many times, passed many people, and not been challenged by anyone. I think it's all down to how you approach people…. pull in and wait for dogs to pass, smile and talk etc…
Personally, Cathkin is now my local trail when I can't be bothered to travel anywhere, less dog poop…