...from the Gallery and other Media apps only just create a directory "Private" and put the files there. That way you could show your girlfriend nice pictures of your last business trip using the Gallery app keeping the spicy details to yoursef But the directory will be available from the both "sort by folder" option and File manager....but how many people would figure it out?
But on the whole -this idea is a long waited app for this device. So I voted for it.