I think in terms of a 35mm film camera (135 format) with a negative of 36mm x 24mm. When I think of lenses and focal lengths, I think in terms of what that lens will give me as an angle of view with respect to a 35mm film or FX digital camera: 24mm = 84 degrees 35mm = 62 degrees 50mm = 46°
In DX format: 24mm = 61° 35mm = 44° 50mm = 31°30'
But I'm not comfortable learning the angle of view for DX focal lengths, so I translate to FX angle of views with the 1.5x crop.
In FX, a normal lens is the 50mm lens with 46° angle of view in DX, a 35mm x 1.5 = 52.5mm whic is pretty close to 50mm and has an angle of view of 44° ... making it a "normal lens" for DX bodies.
Long story longer, yes, do the crop factor thing if you think in terms of film/FX lenses and are comfortable with it.