Am I one of the few who wasn't sad to see JFK's T3 go? I generally try to have an appreciation for historic things, especially historic things relating to aviation, but I found T3 to be a dump, historic as it was (not that T2 isn't). Maybe they could have renovated it to not be a dump while keeping the iconic parts but I remember being very unimpressed with T3. I'm also not the least bit sad LAX T3 was demolished either.

Conversely I don't mind T4 at JFK (at least for connecting - been a few years since I've had to deal with an originating or terminating flight there). Long walks generally don't bother me (though I do think they need to do a better job of keeping the moving sidewalks working). I enjoy walking through terminals walking past gates and looking at the monitor to see where each flight is heading, plus it can just feel nice to walk before or after sitting in a plane for several hours.