How long do you let your meals settle before risking a ride? I keep hearing so much about how big the portions are! We have some 6.30/7.30 dinners booked so are we likely to be up for any rides after these, should we just do the easy ones or are we best forgetting rides until 10pm or so?
However jerky rides don't bother me after eating, but anything that goes in a circle does. Waiting a little while is never a bad thing, but as to exactly how long, I think that's a personal decision....your stomach will let you know! 
So far that's worked out ok.
We usually grab a bite in whatever land we are in at the time & continue on in that area until we have ridden everything & then move on to the next land. The kids are tall enough now to ride all of the rides in all of the parks, so I hope our luck continues as this year we are doing the DxDP.
We eat what we want and don't worry about having a light or heavy meal. We go on the thrill rides right after a meal and have no problems. I know not everybody can tolerate that, but we do okay.