Hey, as a long 2D users i miss sometimes the simplicity of some tools that i think could be translated to the 3d world.
For exemple, in Adobe Illustrator, since some times now, there are ways to select objects other than… finding them and clicking on them. For exemple you could select all the faces of an object or a layer or the whole scene that has the same color on them. Or that has some texture on the back. Or all the face that are the same transparency. The possibilities are endless. If then, you have the possibility to change the texture/opacity/… etc. of the selection… It would then save a lot of time to everybody i think.