While I agree that the user should have the option, there is a logic to have the "share all" features as default in a phone promoted as a "sharing" experience. Just my 2 cents.
i've been using QuickPic faithfully for years, you can even select folders to hide, to exclude, sorting options. I think the Google plus integration sucks ass ... i uploaded a lot to Picasa before it got swallowed up by gPlus ...it;'s one of the driving factors that made me wanna root my galaxy s3.
AH HA!!! If you rename the folder you dont want scanned into the gallery and add a "." in front of it, the folder will not show. You have to force stop Gallery for it to take effect. But if you want to use a picture from that folder, it is still available.