"What are you all hiding from anyway?"
I'm hiding from my in-laws. They park outside and peer through the windows. Sometimes they were outside for hours, either directly outside or further down the street. A neighbour rang me at work once to tell me she'd seen them looking through the windows and the letterbox.
I have been NC with them for about four years now, and the stalking and spying they put me through then (and they still turn up from time to time now) gave me panic attacks.
Before we got blinds I had to keep the curtains shut just to feel safe in the house. Now I can angle the blinds and not feel 'looked at' and it's better than the other option, which was to paint 'fuck off' on the front of the house and hope they got the message. 
The last time I know they were outside the house was about a month or so ago, DH was home and went out to tell them to leave. Then it was days of misery, phone calls and text messages, and threats to come back.
We have blinds with curtains in the living room for two reasons really, one being the spying in-laws and the other being the radiator under the window. I like long curtains that reach the floor, so with the curtains closed the radiator just heated the back of them.
With blinds I can close them and have privacy but also stay warm, or close the curtains if the heating isn't on.
I don't like those vertical blinds that belong in offices though.