Flux uses a more powerful Paste in Location solution allowing users to select an object paste before it, after it or replace it.
This simple but powerful solution is similar in function to copy and paste.
Copy as you would normally then select the object you want to paste before, after or replace then use the Edit -> Paste in Location menu item to select your choice.
This may seem an extremely simple tool but it can save a lot of time not having to look through code to find the insertion point.
If you have your navigation within a container (div) you can easily update it on one page, copy it and Paste in Location -> Replace on all your other pages. Much simpler than using Masters.