I had a Turkey sandwich at Cosmic rays that was really good, my only problem was that the bread was HUGE very tastey but too big to eat it all.
Turkey Sandwich - served with apple slice or french fries or cucumber salad $9.59 . It had lettuce, tomatoe and there was a condiment bar with mustard, etc
I was alone but it would have been a great sandwich to split, I ended up eating about a fourth of the bread and then just eating the insides. Plus cheese fries....no diet on vacation
They also had a turkey sandwich on the kids menu I think it was on regular sandwich bread.
I've never had a sandwich at DHS but if you have a park hopper you could go over to Sunshine Seasons in The Land.
Turkey and Monterey Jack on Ciabatta - with Chipotle Mayonnaise and with a side $8.99 I think I got chips with it, but I also bought a cup of thier Potato Bacon soup....omg best soup ever. I've eaten this twice but I also am pretty sure I dumped the Chipolte mayo for mustard.
Other than that I really do think the best sandwich I had at Disney was the two I had at EoS.
One was a BLT and the other was a Club.
The Earl's Club - roast turkey, smoked bacon, Swiss cheese, lettuce and roma tomato and sandwich sauce Think I may have subbed the sauce for mustard and had a bag of chips with it.
Best BLT - smoked bacon, lettuce, Roma tomatoes and seasoned mayonnaise Did do the mayo on this one (not a huge mayo fan) I split this sandwich with a friend and we each had soup (chicken noodle, yummy and she had Tortilla and said it was fabulous
Turkey is my go to sandwich pretty much so I was glad to find three really good ones while at WDW. I'm pretty picky about turkey meat (not a fan of processed) but all three of these were fine as far as taste and texture.