FredoScale-Bend uses a temporary lattice with user defined segmentation. I have found that if you make a group of the object you wish to bend prior to the bending operation(in which a temporary group is formed, if I recall correctly), this helps somewhat. Maybe not in all cases.
Round Edges, or Round Corners by Bezier also has user defined segment or facet settings. It works best by using a small number of segments.
As Alan said, the results are dependent on segment count, acuteness and radius of curvature.
The condition I see in your illustration is where native Sketchup Autofold did not happen due to any of the above condtions. I can see where this would be mind numbing on a large complex model to manually correct each and every condition.