im not sure about their memory but i know that when you spook a big boy hes usually a ghost for the season so that tells me they remember pretty good. but think about what you said first. too many hunters in the woods so whats the point. well if the deer are alert to the other hunters who smell like hunters and you have scentlok then you have a better chance to get the deer. but if there are too many hunters in the woods you hunt then my suggestion is to look for a better place to hunt