There comes a point when you zoom that you are so close to the pixels that they will show up - your image is made up of individual pixels, that's how it works. In the videos you mention I imagine that they are not zooming in as close as you are. Your Composition size should be the same as the size that you are outputting - if you are going to be, for example, projecting it onto a huge wall than you would use the maximum number of pixels that your projector allows. I think you are distressing yourself for no reason, a pixel is like a brick in a wall - one colour, one shape - the closer you get the more obvious the bricks are.
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