Last May when we went, they kept us behind the turnstiles at the gateway until about 10 minutes before the park opened. They then let us in, but had a "do not cross" rope at the bridge over to France and then one in between United Kingdom and Canada.
Everything was closed, but UK was the closest they let you get before the official opening. If I remember right, you could hear the opening ceremonies going on up front through the loudspeakers, but couldn't see anything. Once the CMs heard the park was open through the loudspeakers, they dropped the rope at UK and Canada.
If you have a vehicle, I would suggest driving over to the front because you can see the opening ceremonies, which is nice if you have small ones, and it's a little less of a hike. It's probably not worth the cost of a cab though, since DH can probably hit Soarin at the same time as the rest of the crowd if he hustles. As said earlier, this is where the majority of the opening crowd goes.
On the West side of the park you have Test Track and Mission: Space right next to each other so it splits the rest of the crowd that heads that direction. Last year, it probably took close to an hour before there was any sort of line at Mission: Space and Test Track.
We did your same plan, last year, and didn't have any problems, except it took awhile for my brother to get over to us with the fast passes. I suggest riding one (M:S or TT) that DH isn't interested in riding on, or go ahead and ride one of them once before he gets there and have him meet you at the ride entrance and ride it again with him.
It was excruciating standing there at the entrance to TT last year while waiting on my brother to get the Soarin fast passes and meet us. We would have been fine riding it once before he got there.
Good Luck!