I think I do exaclty what you do, which I think is both useful and admirable, though usually in my own head.
When my racks are covered with cables and i can't see every model I turn to ModularGrid to help think-through new patching and plan how I want things to work.

Other than my 'wish list' and my 'New Rack' all my Racks are as they are in real life, my New Rack is more of work in progress but I'm being really picky what I buy next, I'm annoying myself that I can't make a descission on what to get next, I should probably makes some music with what I've got more that going around wisndow-shopping for new modules!