When I rekindled my interest in darkroom work in this millennium it seemed to me that modern enlarging papers are way faster than I remember from the 1960s, etc. So I added a 2-stop ND filter to my gear. If printing smaller than 8x10 or so, the filter goes on. By accident in my acquisition of lenses, I have 50, 80, and 105 mm Nikors that all take the same 40.5mm filter size. I use a condenser enlarger (Omega B8) which only uses a 75 watt bulb and my first attempts, on some Ilford Multigrade, were down in the sub-5 second range for a 5x5 inch print without the ND filter. (Good luck burning and dodging!)
What's sort of cool is that I can make 5x5 test prints with the filter on or using worktime, then crank the head up to do 10x10 or so and take the filter off. That leaves me in the ballpark for the exposure of the larger print. It does take some adjustment, presumably due to bellows extension differences, but one test strip is likely to resolve the adjustment.