I am not an enroute controller so I am not really sure what difference it will make to them workload wise with the introduction of the low level stuff.
As a procedural tower controller I can't see ADSB anyway, however it certainly makes it easier for me when Centre can separate longer to help with a sequence or even getting the higher one that is in front through the followings level (5nm radar vs 20nm with no closing procedural standard).
But I am also equally happy to hold you up high and overfly while number 2 becomes number 1 because he was cruising at a lower level. The joys of procedural separation.