The Sanaa offerings have out-of-the-mainstream flavors, and it took me several visits (and sampling my son's more adventurous choices!) to get up the courage to try some...but they are incredibly good...try the tamarind...YUMMY!...not at all "spicy" in terms of "hot"...but definitely flavorful...
Some dishes have a bit of a "bite" to them (I'm not a fan of hot-spicy food, either...but my son is...so I got to sample a bite here and bite there)...the tandoori is his favorite and I loved it too...it's not "mild," but wasn't at all too spicy for me, particularly when I combined a bite of rice w/the chicken & sauce in one mouthful)...
And the desserts are to die for! (I, sadly, find dessert irresistable!)...
I'm definitely a "plain food" person...I do enjoy well-cooked chicken, beef (steak), pork...I'm generally not even a little bit "adventurous" when it comes to flavors...but as noted earlier, I can't rave enough about Sanaa...love the food, love the CMs, love the dining room...and the previous poster who suggested talking over your likes and concerns w/your server made a really good recommendation...the Sanaa servers are the friendliest, most helpful people at Disney!
I guess you can tell that we're HUGE fans...I'll be really interested to hear your own reaction if you decide to keep your reservation and give it a try...I really hope it works out for you!