Don't know much about hunting cornfields. But I wouldn't walk through an area that is so thick that I wouldn't have a shot if I came up on a deer. If I can't get my bow up and clear of the brush with a clear path for my arrow to travel, what would be the point?
As for noise, that's more manageable, although tedious. As some have stated, walking only as the wind blows is fun -- audible camouflage, as I tell my boys. With just a slight breeze pulsing around the mountains this year, I took almost an hour to close a 100-yard gap to about 7 before I discovered my quarry was a doe (illegal here). She still didn't bust me until I went back for my pack much more carelessly. I was walking through an open meadow but behind cover. The grass was noisy (not like a cornfield, I'll grant) but I just waited for the wind to hit the aspens before taking each step. I love a good stalk.
Asbell's "woods walking" trick seems like it may help as well. Quiet may be impossible but deceptively harmless sounds may be doable.