We have stayed concierge level at both AKL and the Poly, and a big factor has been the food offerings - not the dinner, but the breakfasts!
We are a family of five, and the difference between a GV concierge and a regular GV Poly room was about $50/night, using the AP rates. It was even less of a difference at the AKL, about $35 difference between deluxe savannah (needed for a family of five) and the concierge level.
While the AKL's Sunrise Safari was the impetus for our first concierge stay, the price differential made it well worth our while to remain at the concierge level on subsequent trips.
My girls LOVE fresh fruit, juice, milk and hot oatmeal for breakfast, and it would cost almost $10 dollars per person to obtain what they eat at the Mara ($2 - juice, $1.50 milk, $3 oatmeal, $3-4 fruit bowl) In addition, they do not drink soda, so the refillable mugs are no help to them. Just eating breakfast, we have recouped the additional cost of concierge, and the atmosphere of eating in the lounge is so much nicer than at the food courts.
While I certainly would not rush home from a park to be able to participate in the evening offerings, we are often enjoying the resort at that time of day. For example, we had PS for Jiko one night, so we headed up to the lounge for appetizers and a glass of wine before our PS, saving us the cost of both of these downstairs - as well as giving us the opportunity to try out different things that we probably wouldn't have tried at $7-8/plate for appetizers. We did skip dinner several nights on our last trip - we ate a big lunch at around 2-3 pm, and so weren't hungry for a real dinner - the lounges offerings were just enough to keep us satisfied!
When we were at the Poly in November, they did still have the bottled waters out and available later in the day, and they encouraged us to take some to put in the refrigerator in our rooms for another time! We didn't really need to do this, as the AKL concierge had given us larger bottles of Dasani when we checked out there as a farewell gift. The bottles just weren't out in the early mornings at breakfast time when people were headed to the parks, I guess.
I have never, and would never, go to the lounges in my pj's - just not my style. As long as kids were appropriately covered though, I guess it didn't bother me. What did bother me, was the parents letting the kid's free for all through the food. I saw kids taking bites out of fruit, etc, then putting it back, at both lounges. In this day and age, with all the funky bugs around, kids need to learn about food safety and sanitation!