This is because there are TOO MANY forums, with a number of them receiving few posts. So folks tend to post everything in G-Spot (a pretty risque name for a forum that won't allow any profanity and is based on Boy Scout/religious ideals, but I digress!). Lots of people actually preface their post with "I know this doesn't belong in G-Spot, but I figure people will actually see it here..."
I wrote a post a while back about a reasonable way I thought they could be collapsed. A number of people chimed in, mostly agreeing. As was expected, there was no response of any kind from moderators, etc. I'm not saying mine was a perfect solution, but there are very obvious ways to collapse the number of forums, which would lead to BETTER use of them.
As it stands, you have to scroll down 6 or so pages to see all them (part of that is a font/whitespace/layout issue). Many of the forum sections overlap; ones like "Packrafting" have 6 threads in 6 months (or so), and should be collapsed back into the Water section.
I'd be happy to redo my suggestions and post them here, if the moderators are interested in reviewing this possibility. I think it's in keeping with revisions to menu system, the wiki approach, etc.