I didn't have high hopes for the Green version, having done the Orange (before it was 'Orange'), but I was definitely surprised at how close to the original version it is. BUT....without the possible after-effects.
The ride vehicle still moves, but only back and forth. There is no spin to it, so you don't get the nausea you might get from the physical reality of your body spinning while your brain is told you're just moving up or down.
In short, Green is like a mild version of a simulator. If you can do Star Tours you'll be absolutely fine. Star Tours gives me far more after-sensation, in fact. M:S Green left me with no fuzzy brain feeling at all. But if simulators bother you, this one may, too.