Yes Ryan, they are close by! Keep your ticket with you all the time and ask if you are able to get back with it before you leave the visitor platform! There is a snack bar near by and a "McDoof" as we say in Germany (doof means stupid). What I wanted to say was McDonalds
. The problem really is the southwards facing platform! A sunny day would be really bad. Clouds as George said are way better!
Another good thing would be the spot at Highway A5. When you leave T2
there is a small footway leading you to the 25L/R arrivals. You walk straight along the airport fence under the approaching aircraft and after a maybe 15 to 20 minutes walk you reach a pedestrian bridge near the Berlin Airbridge Memorial. There you are facing north with the sun in your back!