I've found that using the translate/move gizmos in Blender with proportional editing active and adjustments to falloff radius works very well for such things, similar but in some ways superior to Wings advanced magnet functions. If you experiment with proportional editing I've found better symmetry accuracy via selecting identical polys on each side of the mesh rather than relying solely on Blender's auto symmetry, which I've encountered some bugs while using with proportional editing. Deformation problems similar to what you might see when parts of a mesh in Poser are falling outside of the spherical falloff zone in Poser traditional weights.

https://docs.blender.org/manual/en/latest/editors/3dview/controls/proportional_editing.html