i go back and forth. i have two free and two fixed bikes....
even though i've been riding fixed for a few years now, on very rare occasions when going over big bumps or rough areas (and maybe when i've had a few to drink) that coasting urge will kick in for a split second and i'll get a little jolt as my foot is kicked up.
it's rare, but it happens.
also, i rode my new pinarello cross bike SS conversion to work today for the first time and it was a weird feeling... like i should be fixed and thus, have very little control over starts and stops (and couldn't trackstand, to boot).