While I have loved many other Disney movies that I've seen, no others have had quite the impact that Lion King has had. I used to watch Dumbo over and over when I was very young, then when I was 8 I got The Aristocats on VHS for my birthday, and I
loved it and still do. Thomas O'Malley was always my favourite character, but The Lion King took over my life

It's the only Disney movie I do fan-art of regularly, that I join forums for etc.
Otherwise, if we're talking animation in general, Watership Down. That movie is part of me as well, much like TLK, but it's influence is different somehow.