Oops nearly forgot - get ADR's for early lunch. Over Easter last year I phoned up the night before for ADRs for a group of 14. We got either our choice of restaurant or a reasonable one that way. We were not deciding on a park until a couple of days prior to be flexible for our whole group which is why we only reserved our ADRs the night before. Do not wait until you are in the park - wastes precious time. Plan to have lunch early (11am or 11.30am) we were hungry by that time and in need of a sit down in the cool air! Park were opening at 8am so we were up at 6am or 7 am to get to the parks in plenty of time (you can imagine, getting 14 people up, dressed, fed and out to the parks is a feat in itself.
Pre plan any character meals you want. Those you will probably not get the night before (but it is always worth checking - cancellations do happen).
The booking window for 180 day ADRs has already opened for April 08
MGM - get fantasmic dinner package. Again - one that I would pre-book in plenty of time.