This is sadly very true; even worse is that I don't always remember if I put them -- hence this request. I have added to the right side of my editor self-closing Bookmark panel, that opens on a click; would it be feasible to dim the icon if there are no bookmarks set?It is also possible to use numbered bookmarks, which can be easier to navigate if you remember where you put them.
...In the Editor toolbar there is also Goto Bookmark icon, that opens a menu with shortcut to numbered bookmarks; nonexistent bookmarks could be then dimmed, too.