Agree that some form of paint is needed to minimise dust problems.
But bare, even painted, concrete will be cold in the winter.
Don't look at the prices in Cromwell Tools, unless you have a strong heart and are sitting down!
Some time ago, Toys R Us were selling 1 Metre square perforated rubber mats, about 25mm thick (intended to catch toddlers coming down slides, presumably) fairly cheaply.
The mat could be cut in half to provide a two Metre strip of matting, 500 mm wide.
Standing on them will be warmer, and more comfortable for your feet.
(I have something similar in hard plastic – donated as nil value scrap from work), warm comfortable, and the swarf drops through, so they only need to be lifted for for cleaning underneath about every six months or so.
Also tends to restrict the movement of dropped 6 BA washers and the like, so making locating and retrieval a bit easier.
AND, you are far less likely to be accused of bringing "that dirty stuff (presumably swarf /oil etc) into the house"
Howard