Workplace accommodations can be easy.
For example, when an employee with carpal tunnel syndrome requests an ergonomic keyboard to perform his job, and his job involves a lot of typing, you get him the keyboard.
Or maybe you have an employee with Seasonal Affective Disorder, which is a type of depression that is exacerbated by gray overcast skies and poor indoor lighting. Several inexpensive lighting products can enable that employee to perform the essential functions of the job.
But, where employers often run into problems is with leave as an accommodation. Job transfers too.