Great Divide is in Denver, downtown (both locations). They probably won't have much of a line at GABF but if you want to visit them it's not far from the convention center. I'd recommend the barrel house over the production facility. Nicer taproom, better beer options, better service.
That said, if you don't get caught in the handful of really long lines you can get through a lot of breweries. I went for the first time a few years back and made it through around fifty breweries. Most of your list will be breweries with long lines, but to put it in context the "long" line will be less than ten minutes of waiting. Many great breweries will have little to no line at all.
Are you coming to Denver for just GABF or will you be around town for a few days? There are a lot of brewery and tap takeover events that week.