SB,
With concierge, you are really just paying for a higher level of service. As others have mentioned, there is the lounge offerings. At all levels of concierge, you'll receive a deluxe continental breakfast that is usually enough to fill most belly's. Depending on where you stay, throughout the rest of the day you'll see anywhere from snack foods to more gourmet style. In full concierge, they serve complimentary wine and beer in the evening and a late night dessert offering with cordials, like Baileys & Kahlua. I don't think you need to be around for every meal offering to make it worth it, but it's nice to at least be able to take advantage of some of this.
The pre-planning department can do much more than make priority seating arrangements. They'll take care of booking transportation needs, like a towncar or limo, recreation like golf, parasailing and spa appointments, entertainment like fireworks cruises, Cirque tickets, Hoop Dee Doo and so on. If you wanted to make arrangements for a private dinner celebrating your anniversary, maybe purchasing some gifts for you before you arrive and setting them up in your room. Perhaps deliver a small replica of your wedding cake as dessert in one of the area restaurants. Really, the sky is the limit on what they can arrange for you. Anyone can make these arrangements on their own, by calling the appropriate number, you're basically paying for the convenience of someone else doing all that for you. In one e-mail, you could have your entire trip planned, as opposed to maybe a few days on the phone. That's what I mean by higher level of service.
Upon arrival, you're usually met by a greeter and escorted to a private check in area. Concierge is usually located on a secure floor or building that you'll need your room key to access. CM staff are available from 7am-10pm daily for any last minute requests that you have.
Room sizes are typically the same, but you receive bathrobes in your closet, daily newspaper delivery (Monday-Friday) and automatic turndown service. Again, these can be requested by anyone staying at a deluxe, it just comes without asking when you stay concierge.
As for "light" concierge, you definitely do not receive sub par service here. The term "light" really only pertains to the lounge offerings. You will not receive the complimentary wine/beer with their dinner serving and you might get a few extra desserts, you won't get the extensive late night dessert offering with the cordials. Other than that, you still receive all the amenities that a full service concierge provides.
I wouldn't give up on the idea and check around for discounts. They do offer them for concierge rooms.
These are just my personal opinions:
GF - offers full concierge in the main building & light concierge in SugarLoaf
CR - offers a full and light concierge, amazing MK views, full concierge is very private (limited number of rooms available, so very personal service)
Poly - wonderful concierge service, great lounge
WL - more limited concierge, no lounge yet so food is served on tables spread out around the balcony. A lounge is scheduled to be built soon.
AKL - wonderful concierge service, some extra perks like the offering of a sunrise safari (special tour of the Kiliminjaro safari followed by breakfast at the Tusker house), sunset safari (night time tour of the lodge savannah and special meal served at Jiko's)
BC - concierge rooms here are slightly bigger, small lounge, excellent pre-planning staff
YC - nice, small lounge, excellent pre-planning staff
BW- nicest of the Epcot concierge, bigger lounge, excellent pre-planning staff
Good luck with your decision,
Tammi