Actually I've noticed the opposite. Since with the new layout and new system most users navigate using the live feed, and since you can filter the live feed quite well, anything new happening on an older question will possibly bring it back into the game.
absolutely! The old set up had different categories where certain people would generally hang out in... but the new set up just throws everything together and makes it hard for people who can answer your questions to find them! I don't like the new set up... I miss the old one. This isn't social networking, it's supposed to be advise!