I assume the extra half hour early access to every resort guest impacts this one. If you want to take advantage of that, you're up anyway then. Combined, the two are clearly trying to get people into the parks earlier, closer to open.
Planning our trip and picking the first G+ at 7:00 doesn't sound so bad when the goal is being at the park gate at 7:30 or 8:00 to get in and be at the first ride right when it opens 30 minutes early for guests. Probably be at a bus stop or in transit by then. At the very least, picking up breakfast.
In fact, my bigger complaint is that breakfast doesn't open until 7:00 and that conflicts with those goals. Breakfast should open 2 hours before park open. First 30 minutes since that's the extra time perk. Then 30 more since that looks like when you want to get to the park so you're in and ready for the early time. Next 30 more to allow for transit to the park. Finally, 30 minutes to allow time to actually eat breakfast first. Meaning today, AK opened at 8:00. That's 7:30 early entry, 7:00 arrive at the park gate to head in, 6:30 get on a bus, 6:00 is when breakfast should open. In that light, the 7:00 G+ start is practically relaxing. The MK 9:00 open just barely lines up with a 7:00 day start, the rest are all earlier.
It's also possible the early entry extra time is super obnoxious. But, that's the perk they're giving for their own reasons.