I am of a generation to have gone through my student years, and indeed the start of my lecturing career, before notation programs were the normal way to write music. (I also wrote all my undergraduate essays by hand. Astonishing to think that I used to have handwriting that other people could read. Sort of; there were some complaints.) It used to take a lot more time to produce a score and parts back then. Oh my, producing parts was painful...but then again spare a thought for those musicians who lived before the invention of the photocopier.
Anyway, using a notation program is not only faster and more legible than writing everything out by hand, it gives you a different relationship with material. In particular, playing back what you’ve just written is fundamentally different when it isn’t you at the piano but a device that is not only external to you (and so will play what you actually wrote, not what you thought you wrote), but guaranteed to play it accurately.
So I am eternally grateful for the helpful people who invented this tool.