I have not stayed at the re-vamped CR concierge, so this is based on prior stays.
1. CR 14th floor. The size of the lounge compared to the number of guests is wonderful. Best food, hands down, of any of the concierge lounges. Also, the best view of any lounge. All of the food comes from the California Grill, and it is wonderful. The CR/GF IPO is the best on property. They don't know how to say "no." The on-site personnel is very good, though some people complain that they aren't always in the lounge. The rooms are huge, and are the most convenient rooms of any concierge lounge.
2. Poly. The food is good, but the service is great. They work miracles getting you into restaurants, and pay attention to the family's needs better than other lounges. As an example, my son is a big fan of buzz, and was telling our check-in host all about it. That night, when we returned to the room, there was an autographed picture of Buzz waiting for him. The lounge has a great view as well. The rooms are not the most convenient.
3. GF RPC. The lounge is great, and while it doesn't feature the great view that the CR and Poly have, it is very comfortable and quiet. The food here is ok. Unlike TammiMcMan, we have never really cared for some of the food offerings here. Some of it is frankly kind of weird. The rooms are extremely convenient to the facilities of the hotel.
4. AKL. The AKL lounge is nothing special, but the service is very good, and I love the juice they offer in the lounge. I don't like that you can end up with a pool view; you should be able to pay for the savannah view room if you want it.
5. BWI. The innkeeper's club would be higher up if only they would rehab the rooms. You have a great view of Illuminations from the balcony, and the lounge is spacious and never seems crowded. The service is quite good, and food is tasty as well.
6. WL. Now that they have a new lounge, the WL finally has a respectable concierge service. The food is still nothing to write home about, but it isn't bad at all. Like the CR, they have Krispy Kreme donuts in the morning, which I really like. The rooms are fine, but the balconies suck. You can't sit on the balcony and look out on the courtyard because of the dormer style of these balconies.
7. GF Sugar Loaf Concierge. These rooms are extremely convenient to the facilities of the hotel, especially the boat dock, pool and marina. The food is good (again with the weird stuff though), but the lounge is way to small and very loud.
8. BC Concierge. I only stayed here one night before we moved to the YC (at the time there was no YC concierge, and we preferred to give it up for the nicer rooms of the YC than to stay in the BC concierge). We were not impressed with the staff service, and the lounge was sort of run down. We have a bad taste from this stay, and have no desire to go back.
9. Club Dolphin. Ho hum. Basically, all you get is food offerings. That is not what concierge is all about, and if it was, this would be a real disappointment. The lounge is often closed, and the offerings aren't great. The lounge is also pretty small (though we were there for a New Year's trip, so the place was packed.)