I don't own a fixie, but I've had a similar experience with my singlespeed mountain bike in that it makes me a smoother, more efficient rider. I can tell when I've been mostly riding my geared bike. My pedal stroke is choppier and my cadence is slower. IMO, singlespeed offers almost all of the benefits of riding fixed with a smaller penalty for failure. Either way, give it a try- it's fun!