I had a similar reaction when I first started riding fixed. I found myself forgetting that coasting was an option on my road rides and powered down descents spinning all-out. I also took hills in a higher gear and I didn't shift nearly as often as I had been previously. I also felt really heavy when accelerating. I still coast a lot less than I used to when I am on a freewheel, and find myself looking further ahead for potential obstacles to dodge.