I agree that it's worth it, especially if you were considering table service anyway - the package doesn't cost any more than a regular meal at the 3 participating restaurants (hollywood brown derby, Hollywood & Vine buffet, Mama Melrose's)
I'd never seen F! til this trip, so I didn't know what the line looked like getting in - it was pretty darn crazy!! Huge swarm of people all down the street (is it Sunset blvd?) we weren't sure it was fantasmic, or where the separate lines for dinner package, FP and standby were. As the line got moving, it eventually became clear where to go for dinner package and the CMs in the amphitheater are good at checking your voucher to get in the correct (center) section. As hectic as it was for dinner package, it would have been far hairier getting through the SB wait, and those people had clearly been lined up quite a while (I think we got there about 30 min early) now that I've seen it, in the future I might try to just catch a later show, but I'm glad idol it this way for a first time and with little ones.