UK, New Zealand, Australia: The electrical plugs with a switch

When you get for the first time in New Zealand, you are in your hotel room (or at a friend's place), you want to plug your computer, and you realise the little green light doesn't light up. What's wrong? There is power around, the light bulb is on!!

Ohhh, there is a little switch next to the plug !! If you don't see the red dot, no power is going through the plug.
Why is it good?
First, for safety: you turn off the power for the plug, your child might not get electrocuted.
Second, for practical reasons: you don't have to plug, unplug, plug unplug your devices if they have no switch. Just switch it on or off !