>>Let me put it another way. Are there certain types of code that we write ourselves that are candidates for #region and types that are not?

Good question, Mike
I'd like to see what Viv says.
In this case, I have several groups of related methods in the class so I use #region to segregate them and hide them while working on methods in another unrelated group.
I really have to break this class up and then I won't need all those #regions.