Did you not read my point 3? You must choose either Predefined or Custom scale. Do not use no scale.
Scaling is what converts your physical 8.5" x 11" piece of paper to be 60 ft x 88 ft. The scaling is applied equally to both horizontal and vertical dimensions. Choose Custom. For landscape, with 11 in = 120 ft, enter those values, with units. Visio will show you the resulting Page size, based upon 8.5 x 11 aspect ratio. You should see 120 ft x 92 ft and change.
The horizontal ruler goes 0 - 120 ft & vertical goes 0 - 95 ft
Now, go back to Page Size tab, select Custom, and change the 2nd box from 8.5 to 2.8. Hit apply or OK. Your drawing page will now look long and skinny, with vertical ruler going 0 - ~30 ft.
That's it.
One more note. As this configuration only uses about 1/3 of the paper height, you can, if desired, have it centered on the sheet of paper. To do this, go to the Printer Setup at b. Click the setup button. In the new window, under small drawings, you can select to center the drawing on the printed page.