One of the major advantages of seperating presentation from code is being able to change the presentation without changing the code. This allows people such as web designers to come in and redesign a website without the programmer having to change his code to fit that new design.

I can personally say that HTML::Template works great for me and allows for easy design changes. As for being able to manipulate tables using HTML::ElementTable, you can't get much more powerful than changing the raw HTML.