I don't think the comparison is valid. Two reasons come to mind.
First, with regard to signs made by passage, not feeding, if the gorilla pictures online accurately depict typical habitat, it would be pretty difficult to move through such "cover" without damaging plants. However, this isn't the case for the cover found in most of North America. I can move fine through a conifer forest (where I've had most of my interactions), oak savannah, and most other plant communities other than some thickets of stuff I'd just go around, without leaving a visible trail. If I can, they can.
Second, with regard to signs from feeding, gorillas are essentially 100% herbivore, however, according to the evidence, bigfoots are not, they are omnivores. Gorillas seem to eat pretty much leafy green stuff. Bigfoots seem not to, their plant material tends to be berries, mushrooms, tubers, and the like. There isn't much evidence suggesting the walk along munching handfuls of leaves torn off trees in a way that would create a trail that you can find.
So .. interesting idea on the surface, just don't think about it very hard. If you do, why it is wrong becomes painfully obvious.
MIB