I was 18 when I first saw Lion King (theatrically in 1994) so I didn't lean any life lessons from it. but the power and emotion of the story, has carved a special place in my heat for the movie (and it's characters) that will always be there. I was amazed at how a movie supposedly meant for kids could have such an emotional impact on an adult. It showed me that animation (even if it is kid friendly) is not something that an adult can not enjoy.
Personally I think Lion King is Disney's greatest movie.