Discourse generally remembers where you were in a thread, but that info does not transfer nicely during a migration. In some cases the thread will at least take you to your last post in a thread if you have contributed. But, suffice to say, this will be a short term inconvenience while you enter threads here for the first time.
To get to the bottom quickly drag the sidebar to the bottom, or just hit End on your keyboard.
Also, we are hopefully building a bit of an FAQ here so people can quickly find their feet with Discourse.