same sensation here. i kind of put away the road bike last october and rode fixed only from october till march of this year when i bought a pinarello cross frame and built it up as a SS freewheel commuter bike.
the first few rides, i could hardly believe the lack of control i felt.
it threw me off that you had to have your hands on the bar in a certain position in order to regulate your speed and everything just felt squirrely and kind of lose somehow.
anyway, of course i was used to it within a few days and am back to flying through traffic every day and appreciating the quick stops and coasting.