I'll always indicate left or right if I'm taking a left or right exit. If I'm going straight over I won't, because I won't be turning right / pulling across anyone coming the other way.
Anyway, I seem to have inadvertently stumbled into the most boring debate of my adult life. On a Friday as well. Time to visit the fridge I think.
That's because the thread has been highjacked. Enjoy your spell in the fridge.