You didn't miss anything. It was, hands-down, the worst attraction WDW has had in the timeframe I have been going there as an adult (last ~15 years)
It was a lazy 'remodel' of the also-terrible "Alien Encounter" - which at least was supposed to be scary and unpleasant? I'm not a huge Lilo & Stitch fan, but he (it?) deserves something better than that dumpster fire.
Someone above said 'it was something to do' - I hope that was an example of 'damning with faint praise.' I would rather go walk laps around the parking lot.