But the funny thing is...I still don't like using infinitely long pages, even in discourse. The scrollbar is a very capable control that works exactly in a way we are familiar with, and we're accustomed to it in ways that the little progress widget simply can't compete with. And we're not going to get accustomed to the widget in the same way unless it really is universal and behaves in a very standard way (like a scrollbar does), so until that happens, I wish people would stop insisting that a page with a goofed-up scrollbar can be just as good because, hey, magic widget!

EDIT: just to give discourse a chance to prove me wrong, as it had been a long time since I looked at their widget, I went and looked at a 1000 post thread on try.discourse.org and I'm sorry, but the experience completely sucks compared to having a real scrollbar. There's no way to tell how long the thread is at a glance (the widget just says "2" and the scrollbar indicates maybe 40% is visible), there's no way to scroll to somewhere in the middle (say, you know you're looking for something around post 200) without incredible tedium, there's no fast scrolling. Their solution is technically gorgeous, but it's just jaw-dropping to me that anyone could be so stubborn as to suggest that this is a reasonable replacement for a scrollbar for content that is of a very long but known length.