Happy 2019
My workflow is the good old "write first on paper and then use lilypond". Many times i have to figure out how to expand lilypond to notate something different or outside traditional notation (thanks to anyone that helped me before). Often I write a very ugly draft that makes sense only to me and them use lilypond for the final version. I find that sometimes lilypond helps me to find a notation solution that is easier to understand to a trained musician because is closer to the notation we are accostumed.
Cheers
Caio