Like all languages, adapting to learning language helps to integrate with public and their culture.
Arabic is an ancient language and cultural background. With the modern learning tools, one can surely learn to speak and communicate with locals. Things are little different somehow as the dialect and expression matters and it could be embarrassing that cultural behavior may take it differently.
UAE has large international community where English and Arabic are widely accepted. All official documentation is Arabic with English translation (in most cases).
It is a good to learn other languages and adapt to cultural change.
People in professional fields and businessmen would surely benefit from Arabic Language.
As you move to different country, you gradually adapt and love the people and country.
In UAE the people are more friendly and comfortable with expatriates.