I've been "playing" around on the boards.. just to get a better feel for the effects of having the threads move to the top.
With regard to Thomas' original complaint about not being able to find threads you were following, my initial reaction is it should be easier, not harder.
If there's a response to a thread it's near the top of the page. You don't have to go scrolling back looking for it.
That seems easier to me, unless I'm having a "DUH" moment.