I hunt from the ground 50% of the time these days. I have a Ghillie that I cut the lower half off of, as well as the left sleeve. Over the last 8 or so years I've harvested a lot of animals from the ground without the ghillie suit.
But the success rate has drastically increased and "busted" rate drastically declined once I started religiously running the ghillie suit if I was on the ground.
Making the ghillie only a coat essentially has made it so convenient to use as I'm bailing out the back door of the house. I throw it on and stalk my way into the timber. The ghillie has allowed for close encounters stalking into my set up where I'm sure I would have been busted before.
I still tuck into blow-downs, high grass, corn fields, etc etc. I do not simply sit in the wide open against a tree. Just this morning I got busted drawing on a doe at 10 yards in my Ghillie. I was in a blow down on a travel route. They caught me off guard by coming in from downwind and the opposite direction as usual, but I would not have got that chance without the Ghillie. They knew I was there from their nose, but they couldn't see me. Ofcourse until I started got to anchor
You have to think of a ghillie as a blind. You're much more likely to have close encounters out of a blind if you brush it in. The same goes for a ghillie hunter. Brush yourself in a bit. (tuck into a blowdown / high grass / weeds / etc)
These animals live in these forests. A random 6' tall 190 lb bush sitting in the wide open that wasn't there yesterday is going to throw some red flags... or white flags in the end..
Good luck. Ground hunting is the best.