The composition of ideas itself? Probably not. Some people loop composition and orchestration together, but I don't. Knowing how to play instruments has definitely made me a better orchestrater, no doubt. Too many times have I gone and asked my wind friends, "hey, is this fun and playable", and, kind souls that they are, they put up with my constant asking. I play the cello as my "main instrument" and compared to most of my wind writing, the scores just look more professional, because I know what it can do
Coming up with a melody, motifs, laying out structure, planning textures, etc. are all things that don't really require instrument knowledge, I think. Instrument familiarity helps with executing those, but not much past that, I think.