IMO the answer actually depends on who you're going with. For groups with adults/teenagers, I'd probably agree.
If you have preschoolers like our family, the Grandstand offers a nearby pool and splash area themed for little ones, and the first access on the bus is a plus.
We have yet to see the new Paddock pool area, but I think it would definitely make the Paddock area a choice for families with elementary aged kids.
Congress Park has the best views, but isn't very conveniently situated to the themed pools and carriage House. This might make the Springs section a good choice for those with more difficulty in walking.
Only area without an obvious advantage to me is the Carousel -- but I bet someone will be able to tell me one!