I know exactly how you feel...
The intercom on the Series 400 Twin Otter is voice activated. I was pretty sceptical about this idea when I heard that this was the way that the Honeywell KMA-29 audio panel worked, but after having flown the aircraft for a few hundred hours, I am very happy with it.
The electronics behind the voice activated intercom are very fast. The intercom activates right away when you speak, and there is no clipping of the first or last words of what you say. I was a bit concerned that the intercom might activate when not wanted during (for example) takeoff, but it doesn't do that. In fact, it doesn't even activate if you open the window, unless you start to speak.
The rocker switch on the control yoke only moves in one direction, that is from the center to the 'radio transmit' position. It's blocked from moving in the other direction, which means that after a few days in the plane, you get used to not pushing it automatically when you want to speak to the other pilot.
It's particularly nice for the right-seater to have the voice-activated intercom during busy times, for example, when reducing power just after takeoff, etc.
Michael