We did, so we wrote this simple but useful app.
When you want to share just one picture or video, open this app and select that image, then feel confident that the person you hand your device to can't quickly look at your other, private, pictures.
You can even set a simple passcode in the app to make it more challenging for them to snoop. Version 1.0.1 adds the ability to use TOuchID for this on appropriate devices.
Of course, they could quit out of this app and launch Photos, so still keep an eye on 'em, but this will help keep the casual snoopers under control.
We now use this all the time when we share pictures. Just look at this one friend, don't swipe through every picture on my device!
You can also Send Feedback to email your comments or feature requests to us, we love to impriove our products based on user feedback!