I think that because our companies are becoming more diverse employee sensitivity training makes sense.
For example, although harassment training seems pretty obvious to most people, some people need the training to understand that they may be crossing a legal line that can cost the company a lot of money in legal fees.
It is important to understand disability sensitivity training because unless you are afflicted with a disability it is easy to forget what the person goes through day in and day out.
People afflicted with disabilities might require extra breaks in order to take medication. They also may not be able to stand for long periods of time.
The manager working with this individual has to be sensitive in order to ensure the company runs smoothly and the employee is happy and productive.