Quite a few settings are for the entire account.

Others can be copy/pasted from within the WTF folder.
Some of these will be saved for the account, and can be copied to other accounts, while others are on a per character basis.

Also, if your software option supports accurate mouse broadcasting (or if you add an HKN (which is free) script for mouse broadcasting), you can turn broadcasting on and then just re-click every option you have selected for your configured toon, so the other toons receive the same options and selections.
Game elements are for the most part in precisely the same position on each screen, so as long as the UI elements are aligned this is a relatively easy/quick fix.
You can also configure an entire team at once like this.