Biggest hassle is when helo drivers slow way down and chew up more airspace, stacking those starch-wings up behind you. Most ILS are shot at 130K+ by airplanes, so if you use 70 or 80 you really bog down the guys behind you. In an S-76, a 120knot ILS is a nice one, and you always have at least 1/2 mile to burn off the speed at the bottom. If ceiling is really at mins, and the ILS runway has only 1/2 mile to the ramp, then maybe slowing to 90 is better, but for big airports and average conditions, I shoot them at 120 knots.
Also, the higher speed makes it easier to track the beam, since a given bank angle error yields a fraction of the turn rate error, so you can catch heading drifts much faster. Also, the airspeed produces more ROD adjustment, since the power curve is steeper at 120, so plus or minus 5 knots is a fine glideslope adjustment.