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When I had a need for this I opted to go with a paid solution. I purchased Bytescout Watermarking PRO. I am very happy with my purchase and do recommend it if you choose to go with a paid product.
I don't know if it seems to be a command line utility. I know it IS one.
It's just a different interface, and that might seem to make things complicated. But actually the command line interface is very straight-forward, I believe
http://www.imagemagick.org/script/composite.php might give an idea of the straight-forwardness.