Please please PLEASE tell me...

That option is still available. If you are on the forums homepage, right underneath the title, you will see a bar that reads "Filter: All Recent | Unanswered | Unread | Your Discussions." The 'Your Discussions' is the equivalent to the old 'My Forums.' You can set your account to automatically filter like this when you click 'Your Discussions.'

When I click that, I get a menu of thread titles overtop of the ads to the right.  I assume that thats not how its supposed to work.  I'm using Firefox, could that be making the difference?  Where should the thread list be showing?

And yes, the smilies are weak...