*oldster creaky voice* I remember when an E-Ticket meant a glorious dark ride with multiple animatronics, dammit, not some new-fangled roller coaster! Well, that's progress for you!
Obvs I'm partial to a high-end attraction I could actually go on and still dream of a Doctor Strange Sanctum experience ala Haunted Mansion or Mystic Manor with Strange and Wong and Scarlet Witch and America Chavez sending you off in different directions.
But at this point, the theme of the MCU seems to be the Multiverse. So any E-Ticket really should be a trip through the Multiverse - maybe helping Loki restore the timeline or having The Watcher send you off on a mission. It would be all thrills and screenz so I couldn't go on it, but it would be nice to have a counterpoint to Star Tours at DL where you can go to different locations in the MCU/Multiverse (though that could also be done with Doctor Strange/America Chavez portals). I guess Mission: BREAKOUT has multiple choice experiences though and probably counts, too.