I just translated that link to english with Google translate and cannot agree with it.
The site is an extremely interactive business site and having the visual separate from the logical saves
me a lot of time keeps things clean.
One complaint about Smarty is that it is recompiled whenever a template is changed. You and your users will never know it has happened.
Another was that you have no control over the generated PHP code. Who cares? It is very fast and efficient and never causes any perceptable delays.
I used to think Smarty was a bit of an overkill until I really put it into use.
Try it. You'll love it.
If you ever stop learning you may as well dig a hole, crawl in and pull the top over yourself.