Hi, Francesca. I also use the page index at the bottom right corner of the page. Many websites put these navigational elements (e.g. page index) both at the top and the bottom because different people may need to use them at different situations. For example, I may be following a particular thread that already has five pages and I notice that someone has posted to it because it is at the top of "My Discussions". Since the links to the threads under "My Discussions" always go to the first page, I'll have to click on "page 5" after I open the first page of that thread. And in such situations, I won't scroll down to the bottom to find the page index.
I also use tab browsing in Firefox a lot and therefore my mouse pointer is frequently near the top. And when my mouse move from the top to the page index, it always crosses the bookmark toolbar. I have to do a U-turn!
I was just thinking, with the many good features of EF including email notification, bookmark may not be something that many users would use much. That's why the suggestion to move it somewhere else.