We love Ohana...........BUT the later in the evening the louder it gets.
Last time (in Dec 09) we had 8pm ressies and it was so loud we couldn't talk to each other at the table.
I was so dissappointed, my best friend lives in Orlando and met us to "visit" but we couldn't because all we could say is "huh, I can't hear you, what did you say?". It was miserable.
Also the later in the evening it gets the slower the servers go.
I hate to be a downer on Ohana because they have some of the best food and dessert in WDW but I don't know if it is worth it going after 6pm.
If your DH has hearing issues it will most likely be miserable for him but that is a guess. Does he have hearing aids? Can he turn them off?
As for the kids stuff, it runs until close to close. I do believe it is about every 30 mins or so. Again that gets SOOOOO loud I couldn't hear myself breathe!! LOL
I have made a decision that when we eat there if it can't be before 6pm it won't be at all.