After you hit the "post" button and you see that your post is in place, use and reuse the back button on your browser until you get back to the post you just replied to (usually three or four times).
As you go backwards you will see the 'review' screen (with your post typed in), then the 'post screen' and eventually, you'll get back to the post you originally reply to. Then proceed forward reading the thread from there.
Ta-da, you've missed nothing (although given the time that passes while you post, you will have some catching up to do).
WOW...here we go again, trying to break the record for postings!
Interesting parallels with FDR in the obfuscation of their physical healths and mythmaking.