Yes, i actually have listened to quite a few number of commentaries... and got to finish them, without ever flinching.
Donnie Darko... the commentary by the cast. Drew Barrymore, Jena Malone, Mary McDonnell, Holmes Osbourne, James Duvall, Beth Grant and Katherine Ross. They laugh all the time. Which i really like, shows that they had a great time doing the film.
Dogfight... commentary by director Nancy Savoca and producer.
Stand By Me... commentary by director Rob Reiner. He leaves large gaps of silence in between scenes. i guess, his feature length commentary wasnt so lengthy afterall.
Others, not that extensive listening.