I tried Pan Pastels at a clinic at a show and I have tried other pastels. Pan pastels are much superior. They are ground much finer. If you see a youtube video, yes, they are that easy to apply and remove. The surface needs to be flat, or matte, to better hold the pastel dust.
I am not yet to the point of weathering rolling stock, I am still constructing much of the layout, getting the locos converted to DCC, and drilling all the %!#@ handrail holes in the Funaro & Camerlengo kits. I only have the Pan black pearl sparkle to dust the tender coal loads.
Pastels are one tool for weathering, I would only consider Pan Pastels for pastel weathering.
Agreed, military modelers are very good at weathering.