Seeing the disk
That's easy - with my eyesight I can see that Venus is a crescent (well, it's an oval blob, but it's definitely NOT a point of light and definitely NOT circular). Jupiter is also resolvable as a disk with the naked eye.
I suspect that Earth's Moon would be just a dot, but a visible one, like the Gallilean satellites as seen through a small telescope. They are ALMOST visible to the naked eye...