Yes- the gui version is just as fast as cli if you hide it.
Drag it into the Login Items and check the keep hidden box.
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As far as the screensaver goes- where I would find it valuable is in the work place where you need to lock your screen as you go to lunch or to the restroom and don't want to log all the way out.
Also, in school classrooms etc. it could help spark interest in science among kids- and that (imho) is a better achievement than anything folding by itself can accomplish
