When I go to the Vocabulary Classes admin page (take dc for example, /admin/vocabulary/1/classes) I see that as of version 2 it no longer shows the items column where you can click to see which items belong to that class. Was the removal of that column intentional? We found it to be a useful feature! Curiously you can still sort by the number of items in a class.
Those links were purposely moved: there were some issues reported from people with large installations that calculating all those counts was resulting in very poor performance.
The count, and the link to the actual items in the class, is still available, it’s just been moved to the “show details” sidebar, so you can get to it by clicking the ellipsis icon.