Just turn down the dialogue volume....I did. There aren't as many times you will hear the enemy spot someone compared to the control point conversions.
This. PLEASE SOE make it stop. I can see just fine on the map and the UI when the points flip, and I've been in a fair few point ping-pong matches so far, it's getting obnoxious as all hell.
Some people need it. It compensates for what the mission system covers such as control points. Its hilarious once you think about it.