My two cents regarding race retreat, updated to reflect 2017 experience:
I've used it for three races (one half marathon, two full marathons) and only when I'm running alone. If I'm running with one of my kids, it's just too expensive for more than one person. It was great for my first runDisney race because I wasn't familiar with the drill yet and it was nice to have a place to go. After that, I said I didn't really need it again. I don't use much of what it offers - I can't eat right after a race so I don't take any post-race food (other than bacon in 2014, but that's the last time I saw bacon in the retreat.) I don't ever want to sit in a chair at a table before or after a race - I would rather sit on the ground. Bag check is pretty easy to navigate outside the retreat and I don't really need that bathroom stop until we get to the corrals. So overall, it's nice but can be skipped.
On the other hand, I keep buying it for the full marathon. This year, it was because
@Keels mentioned the early expo access and I really wanted that for Dopey because I was on my own with our youngest son for expo day. That was the best decision of the trip and many thanks to Keels for the info! But I'm likely to keep buying it for the full marathon for a few reasons:
1. Pre-race weather. This one is super big. I get cold very easily and I would have frozen into a popsicle without it this year. Once my toes freeze, it's over. They would have been frozen for 26.2 miles. So it was nice to stay warm and then as soon as I left the tent, I was in constant motion until the race started. And I like to arrive semi-early for the marathon, so I'm more likely to jump on an earlier bus when I know I have somewhere warm to wait once I get there.
2. Stretching mat area. I sit on the ground while waiting, and the stretching area is perfect for that - uncrowded, pretty relaxed and relatively warm. I don't even use the mats - I just sit to the side on the ground. I used to sit in the kids' area, but then they took away the bean bags, and it turns out the stretching area was a great alternative.
3. Bag check. I like to deal with all my layers and organize my stuff before checking my bag, so it was nice to do that in the warm tent. Bag check was relatively quick. (It's quick outside too, but then I'm freezing while doing all this organizing.)
4. Pre-race fuel! Yay for Boardwalk CL because they put out Kind bars for runners throughout the week and I ate one of those. Then I took a water, a banana (yuck, yuck, yuck) and coffee from the retreat. I could have all that stuff without the retreat, but the retreat made it just a little easier.
5. Post-race chocolate milk. They added chocolate milk at the race retreat this year!!!!!! I can't overstate how much I love this - the chocolate milk access was very valuable!