Yep, I guess it depends on how much data of interest is on the drive. You can hook it up to dmde with a ddrescue/OpenSuperClone-mounted drive, which can let you index the filesystem while it streams content to the backup image. It reads and remembers sectors already copied, and you can target specific files/folders so you don’t have to touch most of the drive.
While you can do command line stuff with CloneZilla, I think what they’re referring to is the TEXT-based guided user interface, which doesn’t seem to differ much at all to the Rescuezilla GUI, which only looks marginally prettier. However, there’s a few other useful tools in there, and a desktop environments, so it’s still a bit nicer to use.