Once you find the character you want you probably don’t want to have to bring up the character viewer each time. Click on the Text tab in the pref pane. Apple has a very simple text substitution system akin to TextExpander or Quickeys. It doesn’t handle macros but it will replace any string with an other string. It’s useful for common misspellings like “teh” or the like. It also handles displaying unicode fractions so 1/4 becomes ¼. What I use if for though are other special characters I want to type.
He puts a semicolon in front of short abbreviations to make them unambiguous. I would use Language & Text substitutions a lot more except that at least half of the times I try to use them they never expand. I end up going into BBEdit and grabbing the same text from its clippings.