For me this isn't specially strange. A pdf is a document, in the sense that it is a finished work (no more editing or fiddling is possible), so I think that people can easily understand what printing to pdf means. And actually this exact functionality has become very popular in Windoze systems. There are a few packages that provide a virtual printer that prints to pdf (CutePDF, PDFCreator, etc...).
Having this functionality in CUPS is very nice. As stated before by Martin-Éric, don't confuse this with the options of a particular application.
For me this isn't specially strange. A pdf is a document, in the sense that it is a finished work (no more editing or fiddling is possible), so I think that people can easily understand what printing to pdf means. And actually this exact functionality has become very popular in Windoze systems. There are a few packages that provide a virtual printer that prints to pdf (CutePDF, PDFCreator, etc...).
Having this functionality in CUPS is very nice. As stated before by Martin-Éric, don't confuse this with the options of a particular application.