Absolutely it can be of assistance.
I took 2 semesters in college of ASL and practice often and I even taught my kids when they were very young with tons of videos, books, games, etc. I do not interact that often with hearing impaired, so I am not as strong as I previously was...but the key to any skill is constant practice.
I also studied Spanish 2 years in high school and study those books, especially the medical ones several times a week as there is a large Hispanic population in Florida.
Many, many times my knowledge of language has helped out on various scenes and I always strongly encourage people to try and seek out basic friendly introductions if nothing else. Not only does this build rapport with the patient or their family, it may just interest you enough to continue on and become fluent.
My old department used to offer a bonus to employees that were bilingual. I do not remember how much it was, but we built it into our contract. Of course you had to be evaluated on your proficiency by a department selected University Professor, but again it was a little recognition of your extra efforts above and beyond the call of normal duty.
I think they also had a cap per shift on the number of Spanish speakers due to many of them knowing Spanish as their first language.
Learning languages is one of my hobbies and everywhere I go, I try to learn as much as I can. When I was in the Arctic, I took lessons in Innupiaq and Russian because those were very common. When I worked in the Philippines, my Spanish came in very handy but then I practiced Tagalog as well. Now in Afghanistan, I have been taking lessons in Dari and Pashtoon.
The one place I had a lot of trouble with was Louisiana and the Northeast (USA)...sorry, you guys speak English...I think.

Just jokes...relax.
Anyways, back on topic, absolutely, your experience and knowledge with these languages will be an asset and there will come a day when you are called upon to use them.
Good job, good luck and keep practicing and learning!