We had the new seals put on the van, two weeks ago. We haven't had tremendously cold weather, but I did put the car through the car wash, while temperatures were still above zero. At night, the temperature dropped to about -5 or so. I have turned all the electronics on for all the doors. So far, not even a hint of sticking. However, this is only two weeks into things. Once we have made it through the rest of the winter, we will have a better idea how this 'fix' really holds. So far, so good. I'll keep posting as we progress through the cold weather.
Here's to hoping this fixes the problem. I really enjoy my Sienna.