It doesn't have to be all or nothing. I'm going to disk 7-8 acres of old field here pretty soon to see what kind of forb response I get next spring. I'm also going to plant 6-7 acres in vetch, cowpeas and may a little milo here and there next summer. I enjoy the process.
I'm not sure of your objective, but a December disking has switched one of my old fields from growing broomsedge and dog fennel to mostly ragweed. I am doing it to benefit turkeys, but it probably helps deer too.