Here's my 2 cents...take it for what it's worth.
I was one that didn't mind the new format, and to a point, welcomed it. I liked several of the new options. Maybe it was easier for me as I was accustomed to using topic view (as it was my primary view in the old format). Every so often, I'd switch over to thread view when discussions got too big and hard to follow, but for the most part I was a topic view user.
All that being said, since the switch, I visit the board less frequently and post even less frequently. I'm not sure why. It does seem that new topics come about lesser and lesser. If I had to guess, that is because the guys that used thread view weren't pigeon-holed into seeing the same tired topics all the time at the top of the page since thread view didn't put the topic with the newest post at the top. Because of that, I think they were more inclined to start new conversations/threads/topics. From that standpoint, whether you viewed the page in topic or thread, it kept the front page fresher. Maybe the posters who prefer thread view aren't posting as much, therefore leaving the front page to stay stale because those who prefer topic aren't accustomed to starting as many new topics as the old thread users were.
Just a guess, I'm not really sure. All I know is I post much less often than before the switch.