The current format works for me. The forum is simply not active enough for sub-forums to be required in my opinion. In saying that, I basically go straight for the “Active topic” button and rarely via through the different forums anymore. By navigating via “Active topics” I rarely see any old spam so it does not bother me much and from my experience the moderators do a good job getting rid of it.
The Fishing Lure board could be turned into a sub-forum of Tackle Talk I suppose.
The sheer size does make the “latest catches” a bit difficult to search through but it does keep everything in a chronological order which is useful. So I am content with the current layout.