I love Drew Barrymore and Justin Long, and the pairing of these two is sweet, cute, and really makes sense. "Going the Distance" is a sweet, better than average romantic comedy, which is heavy on the comedic moments in a really good way. I laughed hard in some spots - Justin Long's best friends, played by Jason Sudeikis and Charlie Day, were a really smart choice, and just made this film a lot better than it probably would have been without them and their comedic timing.
It's standard romantic comedy fare, but definitely has some re-watchability, unlike a lot of the newer ones coming out these days. This isn't to say it's probably not somewhat forgettable given some time away from it, but I would definitely watch it again, and keep it in my collection when I want to watch something I know will make me laugh/put a smile on my face.