In my opinion, I don't even like eating outside in the sheltered areas of the buffet. Just too cool in Alaska, I like my hot food hot.

If you don't care about food temps, and will be comfortable bundled up some, then go for it.
I still suggest you get out on deck when you get to Margerie and Grand Pacific Glacier, even though the ship "turns" this is only a small portion of potential glacier viewng.