Yeah, don't let it get under your skin...the plateau is dreaded by most. I welcome it, knowing that this is where I will get really good interior product results if it goes right. Some members here have even commented while I'm in the middle of a progressive qview, saying 'hope you make it through the stall OK', amoung other things. It'll drive ya nuts if ya let it. You'll think your temp probe has lost it's marbles or something. I don't sweat the dreaded stall.
The plateau should be over somewhere in the lower 160* range, depending on where it started for each individual piece of meat. If you have a probe in it, and are watching it fairly closely, the temp reading will not change for (example) 8-12 minutes at a time.
At 170* + is where it's time for pulling to foil up, if that's what you're planniing...but the meat is much closer to done at that point.
Just be patient with it, and understand that a longer plateau means it was doing you a good job of breaking down the meat, for a more tender finished product.
Good luck with the smoke!
Eric