Because 3D parts have 2D views, whether in the modeling or drafting environment. To be more efficient at 3D, the 2D tools have to improve also. These are my favorite enhancements to sketching and drafting.
#1 - Angular Running Dimensions
#2 - Fixed Length Spline
Raise your hands if your MCAD tool does a great job at modeling soft goods? No? I didn't think so. But with fixed length splines, Solidworks 2014 is a step closer. From tubing to webbing to wires, anything that is purchased as a fixed length item and then bent, shaped, and routed to fit a random path can now be modeled within Solidworks without needing specialty add-on packages.
More Integrated Workflows
Thanks to Matthew West and the Solidworks Blog for images and video.