As most people know, outside of regular system files that are recovered on a crash, journaling file systems don’t really help you out on actual file deletion recovery in linux. Not usually anyways. giis changes this with ext2 and ext3, by making files in /root and /home available for recovery and the ability to dump by location, or file type.
Useful? Definitely. It’s one of the few things that linux has never had. Of course, this also teaches users not to be careful. But in any case, it’s definitely useful for your average user looking to switch to linux. Another fail-safe.