I like CTFT, at least when you are moving the discussion in a new direction. But the problem with it is that it usually means (based on the little experience I've had with perlmonks) that the title doesn't reflect what it was in response to. But this is only a problem in places that don't show an "In reply to" item, such as in "Newest node" (where I most dislike CTFT).

So I support CTFT (in many cases) but heavier use of it would make me push for addition of "in reply to" columns in several places.