Don't know where you found this information, but it can certainly be done using a script and an Action in Acrobat Pro (which I assume you have, since you're on a Mac).
The folder must exist in advance, though. The script can't create it for you.
The tricky part is to find the internal path of that folder.
To do so put a PDF file there and then open it in Acrobat.
Then press Cmd+J to open the JS Console, and paste this code into it:
this.path
Then press Cmd+Enter (using the Enter key in the numeric pad) and it will print out the file path.
Copy everything up to the file name, including the forward slashes, and then you could use that in the code to extract the first pages of your files, which will be:
var outputPath = "..."; // replace ... with the text you copied before
this.extractPages(0, 0, outputPath + "Page 1 from " + this.documentFileName);
That's it. You can run this Action on your files and the first page from each one will be saved in that folder.
If you need help setting up the Action let me know.