Yeah agreed. The plan is to make some sort of homepage that has a curated list or good way to browse them.
When comparing this to Reddit - there's a huge number of subreddits and no great way to look through them all. I imagine the forums will be in a similar situation and I'm not sure what the best solution is besides just curating some basic ones onto a page and then letting the community share themselves and announce the others (via /f/new-forums).