I've always said that this is my favourite Francis Ford Coppola movie, but it might just be my favourite Robin Williams one as well. (Though, man... that's a really hard call to make. Have you seen What Dreams May Come? I'll never get over that movie.)
In any case, I love this movie so much. And maybe you're thinking that's only because I saw it so many times as a child and so it'll forever have a sweet spot in my heart... and honestly? Maybe that's the truth of it. If you haven't seen it, you should probably watch it for the first time with your kid or niece or nephew or someone of that age. I really think it holds up well.