We went to the AAA VIP Lounge in MK while we were there in October. It is in Tomorrowland, and you have to really be looking for it, or you will miss it. I'm not completely positive on this, but I think it was in a little corner of Tomorrowland between Buzz Lightyear and Carousel of Progress. There is just a small metal gate with the AAA logo on it. You walk through the gate and up a small walkway to the lounge.
It's very nice inside. It's air conditioned and they have very nice, clean bathrooms (with no standing in line). They have couches to sit down and rest while you sip your drink. When we were there, I think all of the drinks were in cans, and you had to finish them before you left. If I remember correctly I believe they also had one of those "office coolers" with water too. Each person gets one can of their choice of drinks, and you are not rushed at all. You can sit down and rest for as long as you want. They even had coloring sheets/books and crayons to keep the little ones entertained.
Two important things to remember though, is that you MUST have your voucher to enter and your ENTIRE party must all go at the same time.
I think that about covers it. If you have any specific questions, I'd be glad to answer them if I can.