Hi Danielle!
I am so glad you asked me this! The run/walk method has been a lifesaver for me! I was also struggling with longer runs, and gave it a shot. It's amazing! Not only do I finish my races faster than when I try to run the entire time, but I also have remained healthier and feel great at the end of the race. I like to play around with my intervals during training, and use whatever feels comfortable on race days.
You will see tons of run/walkers at all of the runDisney races, including the half and full marathons. I ran/walked the full marathon in January and there was a high percentage of participants doing the same.
I think that
Jeff Galloway's run/walk/run method (www.jeffgalloway.com) has really opened up the sport to so many people who are intimidated at the thought of running such a long way. Even on a "bad" day, I know I can get through one minute at a time, and then I get a break!
Definitely give it a shot! I hope you love it as much as I do! Please let me know if you have any other questions.