We were at Vero for President's Day weekend in 2002 (checked in Thursday and out on Monday, President's Day). We paid cash for our 2 bedroom so can't help you with the 7 month booking info.
I'm quite sure the resort was at capacity while we were there, but we never felt crowded. Plenty of room around the pool and in the restaurants. (Have to admit that we only ate one meal at the restaurant, though. Mostly cooked in our room, although we did eat out once in the city of VB). The beach seemed almost empty to us - it was like having our own private beach with maybe a few very friendly neighbors stopping by every now and then.
IMHO, VB is a great place for a vacation - lots of things for kids to do. It didn't feel crowded, even though there were people around.
Hope you enjoy your stay as much as we did!