Everyone talking about the parks being “empty” is an interesting situation. For every park except AK (which peaks an hour later), the vast majority of people are to the park by its published opening time. This is largely due to the perception that the 10 hr reservation starts at that time, and now that there isn’t really any “casual” park entry (even for AP’s) everyone is incentivized to show up at opening to maximize their time since they don’t know when they’ll be back next past their next two reservations. DHS’s BG’s certainly don’t help either.
IMO, the answer is to start giving a mid-day entry option for Passholders and Resort Guests, where it really just adds an option for Resorts and Passholders can actually use their passes more while filling the emptier parts of the evening.