I'm not a big fan of Watermarks, so I do my best to disable them.
My config is an external directory for the albums, along with:
watermark images: none
Full Image Protection: Protected view+Disable hotlinking ( I like the idea of having a link to a full image being redirected to the surrounding page, showing context rather than only the image)
However, even though I do this, it watermarks the images with the text "Watermark" which is quite annoying.