Those of you with functioning brains prefer larger downloads
No, those of us with functioning brains realize the download size doesn't matter -- it's the response speed. Since the majority of the download is auxiliary content (graphics, Javascript, what have you), a few kilobytes of text one way or the other won't make any noticeable difference
and waiting for full page loads before replying
Some of us like to, you know, Read The Fine Article first.
Honestly, the delay had never registered with me. Maybe my ADHD quotient is too low?
Ah, right, and having to refresh the page every time you change your threshold?
I haven't changed my threshold in... good grief, I can't even remember. Years, anyway.
I've actually tried the new-style discussion interface several times since it was introduced, and frankly I just can't bring myself to like it. Partly because I hate floating widgets (they flicker too much), partly because I can't (i.e. haven't felt like taking the time to) figure out how comments are ordered, and partly, well, just because; maybe it's the Office 2007 ribbon effect of being annoyed by an arbitrarily changed interface.