There's a classic rule of mine which I reckon applies here - "if you replace something, what replaces it should be better." For example - i've got some great nostalgic memories of the Gremlin's Ride, but Scooby kicks ass, weird projection screens withstanding (new lighting in the high zone more than makes up for it, IMO). I think it's predominantly why we're a generation who clings to nostalgia so much - so much of the stuff we had in our childhoods (Bermuda Triangle for example) was just better in every way than what's there today (Storm, lol.)
So with that in mind, here's what stands out, based on that rule above.
Dreamworld
- Wipeout - saved the park, one of the best theming executions for a flat ride i've ever seen, period. The park is worse without it.
- Steam Trains & Paddle-wheeler - landmark institutions that form the foundation of the brand.
Movie World
- Looney Tunes River Ride - what replaced it is 1/10th the attraction it was and the park is poorer without it (or a good kid's zone, for that matter)
- Police Academy - everyone, and I mean everyone, will remember the plant in the hawaiian shirt for the rest of their lives, but no one will remember what car did sick burn-outs at Stunt Driver.
Sea World
- Skylink - Kinetic. Freaking. Energy. And what a vantage point to see the whole park. Another tentpole ride that the park is lesser without.
- Bermuda Triangle - Doesn't need explaining.
Wet 'n' Wild
- Mach 5 Plunge Slides - as an adult, still mental they existed.