You bet! Every chance I get. If I am in a section of code for some sort of change, I will definitely take the opportunity to update/improve the current state

You bet! Every chance I get. If I am in a section of code for some sort of change, I will definitely take the opportunity to update/improve the current state of affairs. Doesn't mean you need to go through and rewrite the entire thing. For example, a recent requirement of mine was to revise some xml processing to create sitemaps. As part of the changes, I rewrote the logic to use xml LINQ (c#) and the resulting function is much cleaner, and will be easier to maintain going forward. It also makes routine maintenance changes more palatable.