Yes I can see that it would be important to be able to read and write music in such circumstances. Perhaps I will learn at a later date, but for now, I don't intend to be playing in or conducting an orchestra, so I am going to stick to the synthesia for the time being.
I do hope to be able to identify tones by sound eventually, and have demonstrated a little potential in this regard by getting a few correct while guessing. But, it is far more often than not that I am get them wrong at this point.. So I know I still have a long way to go.
Eventually the hand's muscle-memory will correspond with the ear's memory of the notes, and where the keys are, relative to each other.
One of the most important lessons that helped me was to practice with a metronome. It forces the hand to learn more quickly in order to keep up with the meter of the song, and improves timekeeping overall.