"So although the engines may not be producing as much total thrust at low speed, I would imagine the reversers would still be pretty effective. Some aircraft can reverse taxi using the reversers."
A while back we were taxiing in on a slippery, snow-covered ramp in an MD-80 type. There were no taxi lines visible. We approached the gate at a 90 degree angle, turning when the ground marshallers signalled to do so. In the turn, we came upon an area where the nosewheel could not get any traction, and braking action was poor (deice fluid in that area). With ineffective nosewheel steering, we began to slide toward the wingtip of a parked jet. Both TRs were selected to IDLE reverse, then to slightly more than IDLE reverse, and the jet stopped on the spot. We shut down and let them tow us in the remainder of the distance. This might not have occurred if our turn had been more shallow, however, it pointed out a situation where TRs on some jets can be useful even at slow speeds.