Well, if you can afford FLIR you can do all sorts of awesome stuff.
I still think lower resolution video feed is useful for observing general player movement in areas of low ground cover. You can also observe squad vehicles and detect the position of large game objectives. A UAV pass could pick out a large group of players chilling out on break or waiting for respawn which could show a temporary tactical advantage. I would think that players might realize that if they're spotted lounging about not pushing a game objective then opfor might move on their laziness.
Being able to look over forested areas might also be useful for some scenarios. A "downed" pilot could pop smoke inside of a large forested area. Viewed from ground level inside the forest, smoke would be difficult to see from afar. From overview you could get a much more precise fix on the column of smoke as it emanated from the tree line.
Want nearly free GBB gas?