I was just there last weekend, and the park was crowded, but the line for Kraken was never more then 10mins, unless we waited for front row, which was about 30mins.
JTA Wasn’t to bad either, it was a 45min. wait at about 2, then as the day went on, the wait went down to about 20 mins. I also really enjoy JTA, and would recommend going on that first and then drying off on Kraken. Also, if you sit in the very back, and there are "large" people in front of you, the rear of the boat will flood, and you're shoes will get soaked, so just a little warning there.
I'm going back tomorrow, and since last week was the last week of spring break for most schools, the park should be much less crowded. I hope you have a good time there when you go.