If you understand the principles behind website templates you will immediately see the huge benefits to WordPress template systems. Basically it is designed to hookup automated template ideas to a system via which a client who knows nothing about anything can access your site (behind password protection obviously) and update and manage the website that you leave him.
The first time you make a WordPress site it may be a bit tricky for you. If you are not very well versed in PHP and MySQL this site can be all but downright confusing to you. Taking it slow and learning to tap into the functionality of WordPress is ideal however and will immensely benefit you in future sites, therefore you should really consider tapping into it for one site at least to see how it benefits you.