The list for every person is different. That's a fact. Just so long as you get the job done efficiently. It means you should learning the value of everything and how it contributes to your daily programming life. If there is something that is totally useless to you, so be it.

For instance, I know emacs is a wonderful editor, and operating system, but I find I do things better in vi. Does it mean vi is better? Possibly, but not necessarily. It means I work best with it. But it also means something else. Some tools you have no choice to standardize on within an organization, such as cvs, or perforce, or something like it, because everyone needs to agree. You can't use 4 different control systems... but, when you can, it means you have to let others choose their tools when they can... such as their editor of choice, or CGI vs CGI::Application (if you can).