Thanks for the advice guys/gals. We will be in the Sugarloaf CL. How much does it differ from the main CL building?
I don't think it's fair to call Sugarloaf boring. No view like Poly, but it's very nice. The Main building CL at GF has a view of the lobby with live music. Several other CL lounges don't have views; most that do are lobby. Sugarloaf is quieter. The food offerings are almost identical. I had the opportunity to compare one evening, Main building had one extra appetizer, but smaller serving trays.
We've stayed at all CL except WL, and I'd say food-wise GF has a slight edge over all the rest. In a nutshell: slightly better cut fruit (as in a tiny 1/2cup of berries per fruit tray for all guests to share, a few red grapes), 3 asparagus per veggie tray, plain yogurt, sliced deli turkey at breakfast, and brioche 2 of 7 days. All CL have a 24hour fruit basket of whole apples/oranges/bananas; GF adds pears.
The other difference is location. Outer building is closer to the convention center, self-park car lot, GF QS. Main is closer to: monorail, musicians, main building TS, shops. They are both about the same to the pools, bus stop, Narcoosees, boat shuttle.
Also, I suppose it's a matter of preference. It depends if each CL is fully booked, and your timing. Some lounges get full during peak times, but they are also more cozy, intimate, personal. In that sense, I find they can be more relaxing. We found the biggest lounge- Poly - to be very loud. The GF musicians are excellent, but they are not quiet, especially from the vantage point of the lounge.