I'm all for habitat improvement. By planting secret spot you're not providing a sole food source for the deer in your aera but you are supplementing the browse that they are currently living on. This can definately benefit the deer. I have 2 small plots. 1/2 acre of Imperial clover and aprox 900 sq ft of Powerplant. I've seen first hand how the deer are taking to it. I do believe that they are benefiting from the two small plots.
I do not hunt over the plots though. If you can and it's legal by all means do as you see fit. It's not my place to tell you to dso otherwise. But the way I see it, I do not want to chase the deer from this new food source. I want then to come at all hours of the day and to insure I don't disturb them I hunt in funnels and travel corridor around and near the plots but not over them.