To harvest all of the vines you will need a berrycollector.
The most important recipe for most of the vines, is the crafting of a Bushel. You can craft a Blueberry Bushel with 9x Blueberry Vines. Once you've got the bushel, you can't re-claim the vines.
The main purpose of the vines, is the crafting of the newly added food-types by the Soul Forest Mod. You can't craft the vines directly into food, you will first need to craft the vines into bushels as described above.
With Blueberry Bushel you can only create a Blueberry Muffin.
The Blueberry Vine can be used as a farming material, if you would make a big "vine-farm" you can easily harvest more then enough of this vine to make a lot of Blueberry Muffins. But of course it can also be used to decorate the walls.