Another thread about "everything is closed at DHS"
OP I'm a local who visits DHS once a week. It is not a ghost town.
As with all parks there are some attractions in each park that will interest some people and other will just skip.
Could you spend a whole day at DHS if you wanted to do everything? yes.
That being said I understand people with small children might not be able or find appealing some attractions at DHS. There's still things to do for the whole family
Little kids: Voyage of the Little Mermaid, Disney Jr. Beauty and the Beast show.
Teens and adults: Star Tours, GMR, Muppetvision 3D, ToT, RnRC, TSMM
Meet and Greets: Mickey, Minnie, Olaf, Chewbacca, Kylo Ren, Donald, Goofy, Chip and Dale, Buzz and Woody
For everyone: the Citizens of Hollywood, Fantasmic! Star Wars a Galactic Spectacular (I know more so for SW fans but it's still a pretty amazing show even if you know nothing of SW)
There are 2 main walls up, one at the end of Pixar Lane and one blocking what used to be Streets of America, that's it. You're not bumping into walls at every corner.
Skipping this park or planning on only half a day is a personal choice. But do your research on everything that it has to offer before making that decision