It's going to be nicer than storybook as the main coaster will offer more thrill and be longer than goofys whatever it's called now. But even with that being said this isn't a big deal just one nice ride with some fluff on the side.
While not too big a deal, TSL is giving TSMM, one of the most popular rides in WDW, a thematic place to live. Previously, it was just a standalone attraction with a slightly themed alley and store across that alley... it didn't 'fit' into a themed section of the park. Now it will 'live' in a fully immersive Land. Add in family friendly coaster and ride... TSL will be a family-friendly destination.
SWL will be somewhat family-friendly. Disney Jr. is family-friendly. TGMR, which has little appeal to kids, is becoming a Mickey Ride.
There's a recurring motif here... Whatever DHS becomes, it is not going to be the park for teens and adults with very little for kids. It's going to hit all age demographics.