g Ctrl-A increments all the numbers, but every instance gets incremented by one than the previous. First line would be Enum1, second Enum2, third Enum3. It's a really neat feature imo.

Though I did make a mistake, if you selected everything it'd catch the name numbers too, so you'd have to go into visual block mode and only select the enum parts, then do g Ctrl-A.

That said the numbers probably weren't supposed to be taken seriously now that I think about it.