Everyone who travels past your home can see if the lights are on in the evening. They can also see which lights are on in the front of the house.
So I'm going to give you three scenarios and I want you to tell me when exactly it becomes a privacy issue:
1) A single person travels past your house and happens to notice which lights are on.
2) Someone travels past your house and records, on a piece of paper, which lights are on.
3) A Google car travels past your house and records, electronically, which lights are on.
Same thing with WiFi SSIDs here. It is like you standing on the roof of your home and shouting your ATM pin using a bullhorn, then complaining when someone else hears or records the information.
You want people to stop "monitoring" your SSID? Stop freaking broadcasting it at all.