I've had an idea for a while for a TRON attraction. The way I've imagined it is converting the Magic Eye Theater into a queue/pre-show area for the attraction, with a recreation of Flynn's Arcade (think ElecTRONica, but more detailed). Guests would be able to play games as they wait for the ride, then when it's time for a new group to go in a door opens up behind the TRON arcade cabinet, leading down to Flynn's secret office. From there, it'd be neat to do an effect similar to the transporter at the old Star Trek Experience in Vegas, where guests get digitized and enter the Grid. From there, a Recognizer picks up guests and you begin a Soarin' type ride through the Grid.
You would only really need to use the Magic Eye Theater and the backstage space behind Space Mountain for this idea.