EPCOT at the Norway pavilion right before there ride. and there are no FP for them any more, thanks to some Disney magic there line really is not that long ( 30 minutes is about the most I have seen unless it was a very busy day)
I was shocked at how quickly the line went when we met them last week even when World Showcase was fairly busy. Don't forget that Olaf doesn't meet with them, he is in Hollywood Studios.
Also, if you haven't done it yet, go to the Frozen Sing-a-long Show at Hollywood Studios. It is a really good show, and Anna and Elsa are in the cast. And it is amazing to see how all the kids attending the show know the words to every song.
Like everyone said, norway, but I wanted to mention that we only waited 10 minutes and the interaction was FANTASTIC. I don't know how they do it, but they manage that line really well.
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