After submitting a reply, you should see three options appear, including:
1.) Click here to view your post.
2.) Track this discussion. (If untracked)
3.) Bookmark your submission. (IE and Firefox only)
Clicking #1 links directly to your reply, so there is no need to visit any other page. Note, however, that if there is a delay in processing your reply it may not be immediately available, in which case the above links are not provided. In such cases, a note that your post will appear shortly will be displayed instead.
The way you reply to a post, click submit (or whatever) and you have to go to the main page and back to the original post to see your reply.
My 2 cents.