She's only using the Size & Resolution dialog to grab the "front image" dimensions, which you can now pull directly from the drop-down menu (the other functions of Size & Resolution are available directly in the toolbar when you choose W x H x Resolution instead of Ratio)
I see what you are saying, and I see why even though I was seeing that my attempts to implement it were not working.
Where I am still stuck, though, is with the rotation as part of the crop. Is a duplication of that possible from one image to another? This "Front Image"approach seems to only work for pixel dimensions.
You do it with ACR. Open up all the documents you want to Crop, and select them in ACR with Ctrl A (Cmd A). Apply the crop and any other settings that you want synced, and its job done. You can do this with JPGs as well be selecting them all in Bridge, and opening with Ctrl R (Cmd R).
Or you could do it from Bridge by pasting the settings. Open the first image in ACR and apply the Crop and any other settings, and click on Done
Then right click that image in Bridge and Develop settings > Copy Settings
Then select the other images in Bridge and right click Develop Settings > Paste Settings.
This will open a dialog window in which you will need to check Crop which is off by default, and uncheck other settings you do not want to sync. This would work better than opening them all up in ACR if you are dealing with a lot of images.