From what I've seen in residential consulting (several story apartment buildings, smaller health care facilities), AutoCAD is used significantly more than Revit. I had only seen Revit used in just a few congested areas of one or two buildings. When building owners or developers are concerned about cost, they're not going to ask for plans in Revit.
With that said, it may be much more common in industrial facilities. If you have an opportunity to learn Revit, it definitely isn't a bad skill to have.