I think that a lot of this has to do with geography. A machete might be a great thing in South America, but Im not too sure how useful it would be in the forests of northern North America or Canada. I spend a lot of time in the Adirondacks, and Ive never seen a local using a machete, or a very large knife for that matter. They pretty much use an axe or hatchet for chopping, coupled with a small to medium sized fixed blade for normal cutting chores. Its a very versatile setup.
As you already have an axe and good-sized folder, you might be pretty well set. I personally prefer the axe, small to medium sized fixed blade, and small slipjoint. I sometimes carry a medium-sized folder for a convenient backup to the fixed blade. The fixed blade ends up doing 90% of the work, so a backup is important to me.
I dont carry a whole lot for sharpening. I use one of those little folding DMTs for the folder and slipjoint, and usually just a strop for the Marbles fixed blade. Ive always saved axe sharpening for when I get home, which I should probably rectify.
I should stress that my axe carry is only on weeklong trips. Shorter trips usually dont merit the extra weight of an axe or hatchet, since my shelters are not nearly so permanent. I just upsize my fixed blade a hair on short trips, and add a folding saw. A folding saw can work miracles when you only have to cut down trees and branches that are a few inches thick.