Requires the library mod Collective.
Quick Paths is a minimalistic mod which allows players to create long paths instantly by setting a start and end point.
Crouch + Right-click a grass block to set a starting point.
Right-click another grass block to finish the path.
Right-click the last clicked path block to undo the created quick path.
A longer path in action:
Crouch + right-click a block with a shovel to set the starting point. Right click any other block with the shovel to finish the path:
You can right click the last path block to undo the created quick path: