After being disturbed and shot at a few times even dumb yearlings will settle into a spot where they aren't being bothered anymore. I expect that an older wiser deer figures out the signs of hunting season, and probably moves into his sanctuary almost before the season opens. Here in the west that means you need to go where "no man has ever been before". That usually means getting out of the truck and walking into places without roads.
With everyone using ATVs today, those places are hard to find. I went back to an area I had hunted probably 30 years ago and hadn't been there since. Back then there were few roads and almost no hunters and quite a few deer. Today, there are ATV trails all over the place and no deer. The deer haven't been killed, there are just as many deer in the fields as ever, they have just found sanctuaries where even the ATVs can't find them.