A couple of the other forums that I frequent have unfortunately gone that route of having way too many sub-forums without any decent tool to review all new posts. When looking at these forums I simply don't have the time or patience to stop into every sub-forum, so I tend to look in only one or two and just skip the rest.
Though I don't spend too much time there, the BushcraftUK forum is a good example of just too many sub-forums. Some of the sub-forums even have their own sub-sub-forums. Argh!!
I myself very much prefer the all-in-one ETS forum since I can failry quickly review all of the posts by looking in just two forums.