alot of people don't like Dreamworld because they changed to focus on families rather then thrills. a more cynical person i.e me, would say they went this way because its the cheapest way to go.
back in the late 90's and early 2000's Dreamworld was considered to be the better park because it had the best thrill rides and also good family rides. movie world really wasn't much competition back then.
look at it now and mw is considered by most to be the better park because they put good re rideable rides in. DW need at least 2 quality rides to get people interested again.
In regards to staffing of rides at DW unfortunately there isn't much they can do. They would have a massive base cost just to open the park due to the physical size of the park, MW wouldn't have this issue due to it being better designed.