Your pain is not uncommon. The new site did not take into account any of our (Avaya technical staff) feedback or input.
My only advice is to speak up to those who can make a difference. This does not include any contact or feedback forms on the new site.
My biggest problem is that a site which engineers got used to using has now changed to the point where you spend as much time figuring out where to go as you do actually using it.
Personally, I would have been happy if the effort put forth to "improve" the support site had instead been used to make it faster and more reliable.
Then again, the support site isn't the only place where that comment could be made. Global Support should consider replacing the MOH tape with something from a "books on tape" selection...or adjust the number of support staff to meet the call volume. They are a great bunch of guys, but being run ragged.