In 8 your toolbar positions are saved. So if your resize your window it will go crazy as usual. But when you return to it's original size there is a command to restore toolbars.
LAA means that if your use 64bit OS SU can utilise more ram. So those long number crunching waits are reduced. Not quite sure how much ram but there is an article in our Webmag CatchUp that explains it. It was actually written by Twilight Guru Fletch.
Edit
It's 4gb on 64bit. Up to 3gb on 32bit but that needs some tweaking to happen.