But what does "incredible CGI" mean on an "actual work getting done" level? First of all, it meant that everything had to be meticulously planned from the beginning, so much so that they fully illustrated every scene before they started shooting. Director Alfonso Cuaron said that they could have released an animated version years before the movie was ever released, so just be thankful we never got our Treasure Planet version of Gravity. Second, it meant throwing the actors around on wires for really long takes, because that's Cuaron's jam. Sandra Bullock trained for five months to hang upside down without conveying the tension of the wires, and if that doesn't sound incredible to you, go hang upside down from a jungle gym for several hours while pretending to be weightless and let me know how your abs feel.
Abs are in your thighs, right? I have no idea what I'm talking about.
The most amazing part of that is, again, something you probably didn't even think about: Whenever you see one of the actors' faces inside their suits as they float through space, you probably assumed that they just "stuck the actors' face on their in post," because that's what they say all the time. In reality, getting that to work was such a complicated endeavor that they had to invent entirely new technology to create it. They called it "the light box," it involved a two-ton robot, and it killed a test dummy the day before they started shooting.
And the poor bastard didn't even get a dedication at the end.