What sorts of web pages do you do this for? What if the pdf version is difficult to read?
If the PDF version is difficult to read - which it rarely is, by the way - all I need to do is open the PDF and use the links in the page header to go visit the site again - all the details about the page are still there in the PDF, links are still clickable, etc.
And if its really important, and I've taken the time, before moving to my PDF Archive, to verify that the site is not readable due to some layout inconsistency in the conversion to PDF (I do sometimes suspect this with the fancier laid out pages), I Print-to-PDF again after enabling Reader mode/view (Safari/Firefox): problem solved.
But really, there are very few web pages that don't survive the PDF conversion. And anyway, I mostly pipe the .PDF output through something like pdf2text for further grok/grep'ing...
Dynamic web sites? A PDF of my bank website isn't going to help me much.
However, if the intention is to just save a link to the bank website for future reference, my technique still works since every page in the PDF produced contains a header with the URL - just like a normal bookmark.