Not the OP, but I also have a lot of tabs. In every browser I’ve tried the bookmark manager is rather primitive. I once ran into a Floccus bug that duplicated tens of thousands of bookmarks and discovered bookmark managers also don’t scale very well.
The bigger problem with bookmarks for me is the inability to manage relationships. With the Tree Style Tabs add-on in Firefox and vertical tabs in Orion, child tabs are opened in a tree. It codifies my search context and makes tab management quite easy. The analog in bookmarks is using folders, but they’re rather tedious to create when bookmarking and I can’t think of any browser that will auto-create nested folders when bulk bookmarking tabs.