I'm not really seeing the laziness here. It doesn't take much to open a door and it's not like pushing that button picks the person up and puts them where they need to be in the building.
It's a minor convenience and using one method over the other doesn't make a person lazy.
Is it lazy that people drive to work instead of riding a bike, or would riding a bike be lazy because it would be more difficult to run to work?
Who here uses a remote to change a channel? Who sends email because it's more convenient than writing a letter?
Yes, many people are becoming lazier, but I don't think that minor technologies are the reason.
The people who don't take time to exercise when their profession makes them sedentary, are lazy.
Using an automatic door just doesn't save a person that much effort since opening a door isn't really that difficult so I don't see it as being an indicator of laziness.
If the button is far enough in front of the door, it allows the person to continue walking into the building without stopping. I know, not much time saved, but the button's right there so why not push it?
That's like having the clapper and not using it.