I hope i'm not overstepping the mark by telling you this Ami, but I find that it really helps to sometimes click a unit and use the ' key to make the camera follow that unit. During this time you can read the chat for some quick interaction or just create smoother camera changing angles whilst on the move. This can greatly enhance the quality of vehicle fights and flanks.
Another little thing as well that I haven't seen many of the Observer mode users doing. You can still hotkey units to numbers in the game. This makes it easy for you to snap to that unit instantly when you see it's under attack or something. This also makes much more professional camera switches like Dota2 or LoL style because there's not so much flying round the map using the border edges to find action!
Hope any of this helps!
