I'm in a similar boat I have about 2500 favourites in folders within folders also up to 8 deep. In IE 11 I have it set with the menu bar enabled and show tabs on a separate row. It has been set up...
Have a 920 at the moment looking for a 1520 replacement or a 1520 itself if Telstra would stock it.
Just bought Windows Phone 8 Field Guide on Amazon got the PDF as well.
Only 3.6 for me as of 29/04/14 but it dose list one of the new features as.
Now looks great on large screen phones. Nokia 920
I really do like the look of it, but I don't like the look of the 360 so I guess its just my taste.