The current film I am re-watching is Toy Story. You can also find this on the 10th Anniversary 100 Greatest Movies of all time list.
Toy Story is the first of the Pixar movies, with the second (A Bug's Life) taking 3 more years to come out. Pixar has developed a reputation where you can only really judge each of their movies by comparing them to other Pixar movies because often times they far surpass any other animated features. At the time of its release, the animation for Toy Story was groundbreaking, however the animation alone isn't going to cement this in history as one of the best animated movies ever. The story is pure heart and perfect. Just watching this again recently I am amazed at how many times I laughed at the jokes and how many of them are still spot on, even after all these years. It's funny watching this though, knowing that Pixar had troubles creating human characters in the beginning. That is why many of the shots of the groups of children never show any of their faces. There are only a select few people (four I believe) who get their faces shown and they are all distorted to one degree or another. No one is normal looking. This clearly gets fixed in future Pixar movies but it's funny to watch it now, knowing the reason behind their choices. Overall this movie still holds up 20 years after it was first released and I'm sure it will hold up for another 20 years.