We wanted to officially address the current situation of category browsing having gone missing from the site after the latest update (which also affected search for channel honors). We want to apologize for the upset and frustration that this has caused you. We wholeheartedly understand and we have been listening to the overwhelming feedback from all of you to "bring them back!"
It was actually not our intention to take this helpful function away from you. There were technical reasons this had to happen in the short-term, but the good news is that we're working hard on a solution to bring it back. More news when we have it, and thanks so much for your patience in the meantime.
The YouTube Team