Following those instructions takes me (in FF) to threads with new posts in them, but it still requires wading through that thread to find the new posts. The old forum had a "today's posts" in a drop down to made it easier and sped up the process. I think that's what some of us are looking for.Depending on your preference settings, you should be seeing an alert when someone quotes you.
Click on your avatar near the upper right-hand corner of the community and select "alerts".
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Once you click on alerts, you will see quoted alerts as well as any other alerts.
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Let me know if that was what you were looking for.
Another 'button' that would help is something like a "go to first unread post" under the thread title in the forum.