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[I'm the queen of redundant backups: I have info back to 1984....)
Hard to say how many I revisit. I'd guesstimate I revisit 5-10% of them within a year. Although perhaps 50-70% don't get revisited, ever.
To find a bookmark these days, if it isn't on my IE Links bar I double-click on Favorites to open the folder in Explorer mode and do an F3 to search for what I'm after.
Also, some sites don't get added these days because I'm sure I'll be able to find them quickly via the GoogleBar.