My son's issues are not quite ASD (at least as far as we know right now), but in practice the challenges are similar. I used the Unofficial Guide touring plans, but did so more in principle than by carefully following them. I got the kids the Birnbaum's Guide for Kids by Kids and they picked out the rides they really wanted to go on, then I looked at the touring plans and figured out which ones we needed to hit early. I used the crowd calendar to pick which days to visit the parks, and took to heart the suggestions to avoid midday (mostly). This worked really well for us. We never followed an actual touring plan, but the plans were extremely useful in giving us a sense of where and when we'd be likely to run into crowds. Having the GAC made it easier for us to avoid backtracking for FPs (though I definitely did a sprint or two across the park to get FPs while the kids and dear partner paused for an ice cream). So I'd say it's just an extension of life with a challenging child: always have a plan, and always be ready to drop that plan on a moment's notice...