Macy's is a zoo - it's just too big and too popular! I don't go there unless I absolutely have no other option. The store takes up an entire city block, and it's easy to get lost from one wing to another.
Because the store is so big, merchandise is very spread out and you'll be going up and down a lot.
Sales help is pretty lousy - if you can even find someone on the upper floors, you'll be lucky if they will give you the time of day. Expect a wait at the cash register, too.