I think the thing about Avatar is you don't have to be a big movie fan to appreciate how beautiful Pandora is and want to 'step inside' that world. You could easily enjoy Pandora at WDW without caring about the movies. My son is not a big fan of the movies (he fell asleep during the new one and I was like come on now grandpa
) but he loves that area. It's just so beautifully themed. When we first saw it I was just blown away... then at night? I never wanted to leave. I don't know much about the walk through experience but could have a similar impact if it offers immersive elements with what the planet looks like.