Just a simple establishing shot of the city from above, showing construction crews working on buildings or cleaning up debris, would have been enough afterward. No need for a montage or anything.
As for the Avengers comparison, I think what Snyder was getting at was that MOS was trying to take the alien attack a lot more seriously than the one in Avengers, and not give you the sense afterwards that somehow magically only a handful
of people ever died throughout the whole thing.
The feeling at the end (at least before the jump ahead in time) is much more somber and heavy, as you would expect it to be. Not fun and jokey with everyone going out for shawarma afterwards.