100% yes, everything I've written has benefitted from my experience as an instrumentalist.
Trombone less-so than piano, but I find writing music at an instrument to be considerably quicker, more intuitive, and more organic than anything I could produce without it. Hearing physically how tones will react to each other is valuable, regardless of the eventual orchestration.
As a brass player, having an understanding of how instruments work: harmonic series, air, breathing, dynamic control, flexibility and physical limitations is helpful when it comes to orchestration.