In Blender 2.79, it was possible to smooth a selection's vertices directly from the mesh context menu (W) in all edit modes (vertex, edge and face). The function was removed from the edge and face mesh context menu, making large-scale smoothing slighlty more complicated. Smoothing via the Vertex menu (Ctrl + V) gives the same results, but is not as "smooth" a process.
It would be awesome to see the functionality restored in all mesh context menus.
[EDIT] Apologies for the bad description. This was observed in a build from December 3rd (the screenshots are from that same build). After downloading the newest version today, I noticed that the context menu has already changed slightly, but the smoothing option is still present only in the Vertex context menu.