The difference here is that this isn't a new E ticket.
This is a major refurbishment to an attraction that has been around since 1989.
It's not a new attraction even though it seems to be billed as such.
I've never considered Splash Mountain / Tiana's as must do attractions. In my mind the must do attractions at Disneyland are:
Rise of the Resistance, Space Mountain, Big Thunder Mountain, Indiana Jones, Pirates of the Caribbean and Haunted Mansion.
I'd put MMRR, Jungle Cruise, Splash Mountain / Tiana's, the Matterhorn, Star Tours, Peter Pan, IASW and Smuggler's Run into a secondary category of attractions where it's nice to go on but won't break the trip.