I haven't eaten at H&V in years, so I really can't talk from experience. But if I did eat there, I'd want to make sure we saw each of the characters. And I don't like rushing through meals.
All members of the party have to be present at check in for the package. They have been letting people in just after 10am.
Personally, I think the RD show is skippable. (If that's a word?) My son loved it though. He is a huge Olaf fan. A&E are not a part of RD. It's Olaf and the MC (who you will probably recognize from AI.)
You might want to watch a video of the opening show. Deb Wills put up a good one on Allears. Then make a decision if you want to see it or skip.
My son's very favorite part of FSF is Oaken's Funland. He is a true Floridian and never saw snow before.
During the afternoon, (I think around 3pm) the MC and Olaf take the stage and screen again. They show a few pictures that guests have posted on social media to #olafsummervacation , it ends with snow on the streets.
Next time we go, I have the goal of trying a Frozen themed drink (maybe the non-alcoholic "Let it Glow") that I haven't had yet and eating a Frozen Ice Cream Sandwich. It's any flavor of ice cream on a special Frozen sugar cookie. I've seen it on the Disney Food Blog, but not in person.