If this may be your only trip to Disney, I'd say YES....go to HDDR. It's one of my fondest memories with my family in Disney. However, the last time I did it was probably 15 years ago. We went during a couple of trips, but after that we haven't been in all that time.
In short, everyone should do it at least once if they can. The food is good, not great, but the show is a blast.