I think the reason so many movies have a mom or dad that has passed away is that it automatically gives you sympathy for the character.
I agree that Totoro is a wonderful movie! But it does have a scene where Satsuki is yelling at Mei and calls her "Stupid" and says something like "so what if mommy dies? Is that what you want?" It is also pretty scary when they can't find Mei for a good stretch of time.
Kiki is not really scary. Oh, there is a scene where she is flying in a storm and might fall. And there is a sad part where she loses her powers and gets depressed.
Curious George also has a scene where the man with the yellow hat yells at him (after calling animal control to come take him away). Yeah.
Cars is not really scary. Except for the combine scene, but that is fairly short. There is some disrespectful language (idiot, moron, stupid).
The Little Bear movie has an animal that might eat them (like a mountain lion or something?). And one bear is missing his parents, but is reunited in the end.
Sorry for all the bummers. I have a pretty sensitive son, so I notice these things.
That said, he does watch the above movies (with a little parental support the first time). He really wants to watch the Incredibles, but in reality it is too scary - he loves superheroes right now, but asks to skip most of the movie. He thought Toy Story was too scary also. We mostly stick to preschool TV shows right now (Curious George, WordGirl, Teletubbies (cracks my kids up for some reason!), Clifford, Max & Ruby).