Totoro has to be one of the best characters Studio Ghibli has ever given us! I wish I could make friends with a friendly furry creature myself, or get one of those convenient cat-busses. But since those odds are pretty low, I just bought the dvd instead.
As far as the actual story goes, it is pretty simple. But it has so many wonderful characters and situations, that it never gets boring or predictable.
The credits are stunning as well! And the song always makes me smile. Sometimes I actually play it when I need something to lift my mood. Works like a charm!