Sorry it has taken so long to get back to you! It looks as if most of the hot dogs are boiled. Some places will then put them on a grill but not all from what I can see! Hope this helps some !!
Backlot Express at The Studios has a hot dog with grill marks on it. Not sure it helps the flavor muchI want to say the place near Dinosaur at AK too. But I may be wrong about that.
The best hot dog IMO is in Germany. It is boiled or steamed but it is natural casing and 'snappy'. I ask for no saurkraut. YUM
1) Dogs at WDW are steamed, not grilled.
2) Even though they may have grill marks.
3) It is cheaper to put them on a roller or steamer.
4) Plus, they last a long time if not ordered right away.
5) Grilled dogs have to be served as soon as they are ready.