This site was programmed with it. The graphics at the top of the page were positioned precisely within a table. Also essential, whether your working on a Mac, PC or UNIX box. Photoshop is a good design and technical tool. It's an image designers dream.
Layers allow for revision and experimentation.
It's also a good language for many system management tasks. This means that Perl is good language for making websites work. It's useful for creating CGI programs for interacting with forms on the web and for doing a lot of the behind the scenes programming that is necessary to make sites look and act the way you want them to.