The new top bar was designed with the goal of simplifying and bringing forward things that 90% of our users are interested in, and then we took a second pass looking at this from our very active users to make sure that we weren't screwing up your workflow.
Basically, we determined that nobody was using the week and month columns and the revisions and favorites rows didn't make sense. There was a lot of discussion around the votes cast... It appeared to be used infrequently, but it looks like it was a few users using it frequently instead of a lot of users using it infrequently.
The menu isn't coming back, but I think the activity link and votes cast today are legitimate gripes that I'd like to work with you to see if we can come up with another solution.
I'm roughly considering either making the achievements header link directly to the activity tab or renaming the achievements drop-down to activity and having the same behavior.
With respect to votes cast, I'd like to find someplace else to put that.