Getting used to anything new takes some time, but the new Forums have some pretty handy features you may not be aware of. Click on your name in the Forums sub-menu:
This will take you to your user profile page, where you can set various preferences for the Forums, but it also has some tabs you can click on that display some really useful information:
Notifications: This shows you a timeline of any activity on the site, such as people commenting on your discussions, sending you private messages, etc.
Activity: This shows you, in chronological order, everything you've done on the site, and can be pretty handy for finding a recent discussion you posted in when you just can't remember the name of it (and didn't have it bookmarked). You can also post your own status updates under the Activity tab, analogous to Facebook status updates, to let people know what you're up to
Discussions: This shows you all of the discussions you've started, in chronological order, with the latest discussion listed first. This is useful to find all of the discussions you've made, in case you want to follow up on them.
Comments: This shows you every discussion that you've posted a comment in. It's particularly handy if you replied to someone's thread, but can't remember which one it was, and want to follow up on it (and didn't have it bookmarked)
Liked: This shows you all of the posts you've made on the forums that other members have "Liked"