Under the Products => Variants tab you can now hit "Edit variants", and get direct links to the variants in the Path column.
This path should be linked up even when not editing variants, to provide an easy shortcut to the variants from the product, to ease up the editors' work a bit.
Late reply, but as I posted in another thread and as you probably know this feature has been implemented in the time since this feature request was posted.
Yup. thumbs up!