User blog comment:Sarah Manley/Try the New Wikia Editor/@comment-4315861-20110623172636/@comment-802147-20110624155531

The help page lists what a minor edit is, although you can specify what a minor edit is on your wiki. You don't even have to mark your edit as minor. It's only there so your edits aren't shown in the recent changes if you're about to make tons of small spelling edits (e.g., "See Also" to "See also"). That's the point of marking your edits as minor so people can filter these.

What other reasons do you want to mark an edit as major, other than to say someone did an "enormous" work?