Never heard of the 'switch off' system, sorry! I like Blizzard beach and Typhoon Lagoon but Aquatica was by far the best out of them all.
We had 14 day ultimate park tickets for Disney so we could go in and out as much as we liked. We also bought the same type of ticket for the pther parks, which included, Universal, Islands of Adventure, Seaworld, Wet & Wild and Aquatica. We get a good deal from an online ticket company, have used them a few times now. We went to busch gardens last time but gave it a miss this year.
Bellavita, my friend went to Aquatica last April and had an awful time, exactly as you described, closed by 10am and no sunbeds. She gave me such a dreadful description of it, I was dreading our visit. We went for an afternoon in the first week we were there and loved it, ended up going back for a whole day the second week. Luckily, we chose the hottest day, as it went a bit cooler the next day!
We also went for a boogy creek airboat ride this time, never done that before, it was fantastic, would definately recommend it.