On the new system, to make things more simple, we are sort of phasing out sub-forums and replacing them with tag categorization. That is why drilling down to subforums isn't so obvious. You are instead of drilling down to tags. I realize this will take some getting used to, but it does allow a lot more flexibility in the future.
Like all things (Windows 8) change is needed.
I for one am all for changes that benefit us and the community.
Oh and jpishgar, not sure if you have messed with it but IE10 is pretty darn fast. Faster than IE9. I went to 8 the other day and haven't had any issues yet.
Probably will get FF for this though as I use it for things like this for fun.