I know I'll be a minority on this one but, I like Hall Of Presidents. It kinda reminds me of the American Adventure and I've always been a history buff.
I love the Haunted Mansion too! My son (6) can't wait to ride it for his first time. My daughter (3) is a little too scared of the dark, so she will wait with her dad.
Love the Haunted Mansion. I also really like Hall of Presidents but it is not something my kids really want to do. So most trips we end up missing it. But we never miss Haunted Mansion.