Seeing herds of deer is no big deal. You just happened to see a herd doing their thing. We see deer out here all the time, and they do their thing like cross the highway after dark and get themselves killed and trash motor vehicles! Out here, more deer get killed on the highway than what get hunted. Boy, ask me, I know from experience they do A LOT of damage to cars/pickups!!
I think the deer population is increasing, so when you see deer you think it is an exceptional event. Those of us who have to live with them don't think that, sometimes we cuss 'em because they like to eat our gardens and the hay we put up for the cows!!