In my current field of public health, bilingual Spanish will make you an infinitely more attractive candidate to an employer. Unlike other hard or soft skills that employers could develop in their new employees if they devoted the time to workforce development, bilingualism in any language cannot be taught on the job. I imagine in the healthcare field that this is even more the case - and not necessarily because your clients don't speak English at all, either, but because they are more comfortable discussing sensitive concerns in their native language.
Becoming minimally conversant may not help you conduct your patient visits 100% in another language, but I think it will go a long way towards imbuing good will and developing a relationship with your clients. I have coworkers who speak only a few words of Inupiat (Native Alaskan language) but it can cause a sea change of openness and cooperation in certain clients! It shows investment in the culture, a willingness and dedication to meeting folks where they are, and I think that alone can be very powerful.
In addition to Rosetta Stone, you might start watching Spanish news, TV shows, novelas, etc. and try to practice with a Spanish-speaking friend. Recognize, too, that there are many dialects within the language depending on whether folks are from and so there might be more slang than you anticipate, or slang that differs between cultures (e.g., the same word meaning two VERY different things - that can be embarrassing to a non-native speaker!)
I hope that more OT programs start offering Spanish for Healthcare Professionals.
