I think that's one of the things that has always put me in kind of an odd niche. It's that all of my understanding of orchestral music is via film, not via classical music like it's supposed to be. To me it's the same, it doesn't make any difference.
It sounds really stupid, I hate making cosmic comments like this but, I just let it do what it wants to do.
I don't see myself necessarily having a burning desire to write a symphony.
I'll just start laying out the melody exactly where I want it to fall. And then I'll go back and fill it out. Whereas, in other pieces I'm really just going a couple bars at a time.
In some types of music I'm working out all the chords one bar at a time - the whole structure, because it's about that. And there are other pieces which are really about - okay, the melody is going to start here and play through to here.