I think that worst than having to reorganize the toolbar, as well as the icons, is to have to remember where they were in the first place.
So once I have all my menus and toolbars in place I do a print screen of sketchup and save the image somewhere I can refer back once sketchup has bugger up.
I know this is not ideal, but it may save you a couple of minutes.
Let me know if someone come up with a definite solution.
Cheers