I wouldn't use the words "cluttered" or "confusing", but for Notifications, I think that the yellow background for new notifications in the poppet menu was much better at quickly seeing what was new and what was old, and the number for new notifications poking out from the bounding box had a much better aesthetic appeal to me, and more clearly indicated that there was something new (I am visually impaired btw, and it caught my eye much better)
Seeing all new threads is somewhat of a similar deal. Locating the button felt easier before. It blends in more with the background now, where I felt it stood out more before, making it easier for my bad eyesight to quickly scan across and find it. - But these may be issues only I have, and once I get really familiar with the new look, rabbit may make these complaints irrelevant