I certainly visit some forums more than others (and have my filters set-up for such), but one thing I love with other sites is an "all" option that just lists the most recent activity for any/all forums
So perhaps below "Forums" in the left-nav, and above "All My New Replies", there might be a "Forums Recent Activity" option that would list everything posted within the last 72 hours. Or just paginate a list going back even farther.
It would disregard any forum filters users have setup and just list the topics that were contributed to within the last x hours. It could re-use the "All My New Replies" listing format (https://gametz.com/?A=Forums&amnr=1
) but instead of what I'm watching it would just go by date. Something like that.