Can I close all layers? or even better, stop illustrator from opening all layers when I open a file?

Question

I just installed cs6, and when I open files in Illustrator, it opens all of the layers which contain sublayers.  It does this even if all the top-level layers were closed during the previous save.  The files I work with have a large layer-structure, so re-closing the top-level layers every time I open a file wastes a lot of my time.  Can I close all layers at once, or better yet, can I stop Illustrator from opening all of the layers automatically when I load a file?
If not, then WHY on earth not?  I can't be the only one who opens and closes large files with lots of layers and sub-layers...
Thanks for your help.
Edit: I also am noticing this problem is even worse in cs6, because openning and closing individual layers plays a little animation of rotating the triangular arrow before the layer which, cute as it may be, just makes the task of individually closing up all my layers that much more tedious.  Can I turn off that little animation of the triangular arrow when opening and closing layers?

Answer 1

You can save it as a pdf and when you open that in AI the layers will not be opened even if they have sublayers.
Not true. Does the same nonsense an .AI file does. Saved as a .PDF, closed Layers/subgroups get opened.
And no one cares!
I do. Every other Adobe program with a layering sceme seems to be able to remember that you saved a file with all layers and subs closed. But not this one.
Maybe someone from the AI development team should ask someone from the Photoshop team how they've managed it.....for decades.