It's not about the page, it is about the mouse. If you grab the page with
the mouse (keep left mouse button pressed) you can drag it to the bottom
of the screen. But then the dragging stops, doesn't it, as you've reached
the bottom of the screen... But in Okular, you can continue to drag
because it 'wraps' the screen by moving the mouse to the top of the screen
and you just drag on.
It's tiny, hard to understand (clearly) if you haven't seen it, yet
completely intuitive and unobtrusive. Just a nice touch.
Similarly nice is finding stuff in Okular, btw. I find the search bar on
the left, which only shows the pages where the search results show up so
you get a quick overview of where the term you were looking for is, far
superior to Acrobat's approach. Acrobat lacks such a simple yet effective
search - you have to go through everything with F3.
Also the automatic scrolling (shift-arrow down) is very nice, I've used
Okular a lot to read from the screen, adjusting speed with the arrow keys
(shift-arrow, again). Press shift to stop scrolling, shift again to
continue. Space to move one page further, shift-space to go back. Sure,
Acrobat offers auto scrolling with the mouse, like word and most
webbrowsers, but it's far less nice imho.
Again, tiny differences, but as I don't use any of the advanced stuff but
just read and search for stuff (and annotate sometimes) Okular is perfect.