There are a lot of users (and developers) who, while competent in their own fields, are going through a learning curve for SQL. There is no reason not to make their job as simple as possible. Comments about the skill levels of the people someone else has to support are about as productive telling someone that they work for a jerk.

However, I missed that you were using a table for non-workdays only.

I would enjoy reading an article on your approach, and SSC can always use more content. Since not everyone takes the time to read the discussions posted after an article, why don't you do a short write-up of how your system works and the advantages you gain from it?