It’s Toy Story, not grown up at all. It would make no sense to put in a thrill ride that kids couldn’t ride in a section that is themed for kids. I’ve never had the impression that HS is more grown up than the MK.
I think the idea that HS is more "adult" comes from the fact that Disney did kind of a poor job putting in things of interest to kids. The "kid" things they included were attractions rather than rides, and sometimes had a limited (young) age range appeal, like Disney Jr. characters.
When we took our kids a few years ago, TSL was not yet open, but our kids were past the age where they cared much about meeting characters. The result was we skipped HS. There just wasn't enough for lower elementary aged kids to do there, between having so few rides and the available rides being height restricted. Last fall, my boys were older, and we had a blast, but they were tall enough to go on everything, while still being young enough for Trials of the Temple. Unfortunately, I couldn't get them interested in "girl" things like the Frozen Singalong or Beauty and the Beast - hoping my 4-year-old daughter will be more amenable so I can finally see them. But I think she'll be too little for any rides other than TSMM and AS2, so HS might be a show and character meet park for us. That's not necessarily a bad thing, but it leads to HS being less well-rounded than the other parks.
I think, if anything, HS could use more rides that can be enjoyed by the whole family. Right now, it feels a bit separated, having fast/scary rides like ToT and RnR for older kids/adults, and then Disney Junior stuff for preschoolers. TSL does a nice job of providing a few things that can be enjoyed without splitting up the family, but I'd like to see more.
The people who see HS as a full-day or multi-day park seem to be the ones who are okay with "big" rides (by Disney standards), while also still having the touch of childhood needed to enjoy fluffier fare like meeting Vamparina. I think what we're seeing on this thread is that there are people who don't switch easily between those extremes, so for them, about half the park is uninteresting (little kid stuff) or unreachable (fast/scary height restricted rides).