I'm indifferent either way. That helps, doesn't it?
While you don't have to take care of an infant while pregnant--for planning purposes (and for our use year we have to bank in July)--if you have to decide so far out from the trip, it is difficult to predict how you might feel.
Now, I was fine--so it would have been fine.
But my last pregnancy--day 2 of an extended family trip, I had to rent an
ECV b/c I physically couldn't keep up with anyone and could barely walk from the bus to the entrance as it was. That can get pricey quickly of course.
I also don't mind traveling with an infant--it does allow me to enjoy more since I will not be on ride restriction and health wise, I'm more guaranteed to not personally have physical issues as I would be while pregnant. I've also had luck with all of my children in that for each of them--nap time was portable.
So again--it is a toss up and a total matter of preference. For me, it would strongly depend on my desire to go to Disney if all else were equal in that I could manage the park physically in either scenario.
I went to NYC at 35 weeks pregnant (opportunity presented itself and I was clear to go)--while it wasn't disney...it was lots of walking and it was exhausting. And I was only there for 2 days. But since it was kid free otherwise, it was the time to do it and I was fine not waiting 2 years before the opportunity would present itself again.
I'm due in 2 weeks and though we still have AP's good for a few more weeks--my last trip was in March. My son turned 3 and I dont' want to cheat the system or buy him a ticket. We'll buy him a ticket when we use our GAD vouchers this summer for dd's birthday. Seems like a waste to not use our AP's, but DH isn't hear and I'm just tired.