My vote goes for Adventureland. . .although with the added Aladdin ride, it isn't as great as it used to be. I love crossing over that wooden bridge with the drums beating.
That being said, I know this will sound silly, but I actually love the look of Liberty Square, too. Sure, it's simplistic, but it really looks like Philly to me (with the look of Independence Hall, and the like). Plus, with the waterfront view and the Riverboat going by...Ahhh....I miss it all!
RyMickey