I just switched from Eclipse to Android Studio. For what I saw since now the new IDE has a lot more features than Eclipse, and I like using the new IDE for my app developmen
To open the Android device monitor simultaneously with Adb, Run the montior through the command prompt instead of visting to the Tools->Android->Android device monitor
To run via the Command line interface navigate to the :
Android/Sdk/tools/ and then run the monitor (for linux run -> sudo ./monitor)