Yes, knowing how to craft and ender eye is great. Knowing that it exists is fairly important, and similar to other items, lots of guessing or looking up online how to craft an item isn't any fun at all.

However, the advancement "follow an ender eye" seems to remove the discovery aspect of figuring out what it does. Wouldn't it be better for the player to figure out that the eye always seems to travel in a certain direction? I think the advancement should be changed to "Craft an ender eye" that would be achieved when the player crafts the item. The fact you can see the "enter the end" advancement after it should give major incentive and excitement to figure out what the ender eye does.