1) I use a mouse with a scroll wheel and the default setting is to scroll three lines at once, and I use the scroll wheel a lot. None of the scrolling effects ever look good for me, and if it's a site which depends on the scroll effect to communicate (a few marketing sites have done this) then I don't get the message.
2) When I use keyboard shortcuts (which I do quite frequently buy I realise most users don't), I just hit page up and page down. I see none of the effects.
To me, this is as bad as hover effects on tablets. I just can't see how it helps to improve user experience or accessibility. Sure, sometimes that isn't the desire but even in the case of those marketing sites I'm fairly sure the marketing men behind it would be appalled to find out some of their target audience was communicated to poorly. Though the worst thing is those same people on other sites then disable some key presses and default keyboard short-cuts to make sure there is no choice but to go through the bad UX to be communicated to.
What worries me when I see these things so high up on HN is that I fear others think this stuff is good.
Is that the case? Is it just me who prefers the idea of the client determining how to render something and not putting such stuff on the websites we create, or to put accessibility to all pretty high up?