Then it is only the door that we're going thru that's unlocked. When we go to the door to let someone come in, the door’s closed behind them and it’s locked… I get the feeling that sometimes they feel like they’re in jail, with the thud, clank, clank-thud of the door closing, the sound of the smaller door knob lock turning and finally the sound of the deadbolt engaging.
Side note:
Our curtains are also the “motel/hotel� quality that keeps the sunlight out… Here in Texas heat we have found that it keeps our electric bills way, way down compared to our neighbors. Our highest electric bill this summer so far has been less than $200.00, even though we have to use more lights during the day. Keeping the sun out has really improved our energy usage. This also has a benefit that no-one can see in our house at any time! They can’t see what we’re doing, or even if we’re home. Our house always looks the same, home or not. Somebody just walking or driving down the street can’t even see a shadow of us on the curtain. We absolutely love this additional security.
[Our] Keys are not always carried
so we put a keypad on the garage door. 
I agree the best defense of any home is a dog. They are so much better than any alarm. Dog's are PROactive not REactive alarm's are.
Alarms go off when an area of the premises is intruded, a dog starts their warning when they sense anything abnormal... albeit it could be a cat but you still get the warning. Heck, even that cat could be rabid.