The river boat doesn't go to Tom Sawyer's Island... The Rafts do...
What is there to "get"? That area of the park represented a period in American history... Much like Liberty Square and Main Street. It is charming, the active riverfront adds lively kinetics and the boat rides are very sweet and nostalgic. There are many Theme Parks out there that started out like the Magic Kingdom and ended up being Six Flags...If you don't "get it" then perhaps an "Amusement Park" is more your style... No judgement... but there are many things that are meant to appeal to many people...not just one person.