There are reasons why Preview most likely to be used by people.
One of those, Preview provides a feature called Slideshow. With slideshow, all pages on the PDF can be read in full screen. The environment for Slideshow is similar to that of Expose, one of the coolest feature presented by Mac. Slideshow also provide Autoplay so it will be able to cross all the page automatically.
This is how the slideshow looks like when it's being played automatically..
Slideshow view can be accessed via Preview Menu Bar.
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