I had an LG with a third rack that I used for silverware. Worked very well. It was awesome having all the extra space in the bottom rack for pots/pans. I put large utensils like ladles and wide spatulas in the 2nd rack.
I really missed the 3rd rack when the LG was replaced with a GE. Even now, with my Whirlpool portable, I use a very small, 2-section basket for silverware in the lower rack. I think it was actually meant to be a utility basket for the upper rack, but I stuff it full and only occasionally have to clean off a few yibbles.
I use nothing but the 1-hr cycle on the Whirlpool with great results. The thing cleans well, but is as loud as a bowling alley. Would hate to hear it roaring away for 2-1/4 hours in my open-plan apartment using the Normal cycle.
Looking forward to seeing the results from your new Bosch tomorrow. You may grow to love that 3rd rack as much as I did.