I love Jiko for all the reasons you mentioned: the food, the atmosphere and the service. I've had my birthday dinner there twice in the past 3 years and just made an ADR last night for my next birthday. I celebrated my birthday this year at the California Grill and it was very nice, but I prefer the food at Jiko so next year I'm going back to Jiko.
DH and I are vegetarians and Jiko has more interesting vegetarian options than anyplace else we've tried in WDW. I get cravings for one appetizer in particular, the "Lentil Pastilla" - Lentil filled phyllo pockets with a sweet and sour sauce. I could make a meal out of just those and a nice salad and dessert. DH's favorite appetizer is the "Taste of Africa": Kalamata Olive Hummus, Malayan Spinach Lentil dip, Moroccan Chermoula, with Pappadam, whole wheat lavosh, and flaxseed Naan bread. I love the tandoori butter that they serve with the bread. Yum!
I'm usually too full for dessert but last time we were there we split the Pistachio Creme Brulee. It has a layer of chocolate on the bottom and it was heavenly!