I don’t manually type the Unicode characters for any of that because I’m usually using TeX, where typing three dashes becomes an em dash and there are commands

I don’t manually type the Unicode characters for any of that because I’m usually using TeX, where typing three dashes becomes an em dash and there are commands for Greek and other characters. I use xetex for a little project, and while some of those character mappings are very convenient others are not. Vulgar fractions, for instance, work in some fonts but not others. For instance LTC Californian Pro has the unicode glyphs for the vulgar fractions, but xetex doesn't translate e.g. 3/8 to ⅜. Goudy Oldstyle is missing many vulgar fractions (e.g. ⅜), but the tex mappings work. Go figure. Granted, fractions aren't mapped to keys in OSX, but I use plenty of those mappings on a regular basis including the bullet (•, ·), degree (°), accented characters (á, é, í, ó, ü, ö, ñ), currency characters (£, ¢, €), and the section character — §. I can get all of these with simple keystrokes and, best of all, zero fiddling with keybindings.