I have a number of sites I frequent in my spare time as well.. But life circumstances change my routines, or at least I like to think I change them periodically I suppose. I don't want to delete my favorites though, I have a number of links to utility sites for paying taxes, insurance, and a few other categories (travel sites like kayak.com, airbnb, etc., shopping sites like Amazon/Ebay/CL/Newegg, for example). If my habits change, I typically change my bookmarks, but I do like to have a bookmark bar displayed in my browser, with very short clickable links to weatherunderground, SG administration, Google, Amazon/Ebay, etc.
I also visit other sites somewhat regularly that I have no bookmarks for, like Youtube, IMDB, etc. that just come up in search results on certain topics, or I know the URLs for by heart.
As to dropping them all and starting over, I'd probably gravitate to at least a subset of the same sites, as they provide the best utility for me atm.
Bookmarks