The next time you're in a Print dialog box and you click the PDF button, the menu includes your folder aliases, using each alias's name as the name of the menu item. Choose one of these folders, and OS X saves a PDF of the current document in that folder — you skip right past the file-navigation dialog. OS X uses the name of the document, file, or webpage to name the PDF.
You can even combine the tips I've shown you here in order to create keyboard shortcuts for custom PDF menu items. For example, I've assigned Control+W to my Web Receipts item, so I can save an online receipt to that folder by simply pressing Command+P (to bring up the Print dialog), followed by Control+W.
PDF-menu shortcuts weren't always reliable in Mountain Lion or earlier, but I've found them to work well in Mavericks.
The PDF menu also supports AppleScripts, Automator workflows, and applications, but those are topics for another time. Thanks for watching.
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