Every business I've worked with over the last couple of years of consulting
OK, but if you're going into a business and consulting, that already suggests both a certain scale and a degree of awareness within those businesses, so this isn't likely to be a representative sample.
I'm not consulting on the GDPR, and my clients range from 2-person companies to 2000 people with most of them being much closer to the low end than the high, so while it certainly will be a biased selection in other respects (e.g. they're companies with a certain degree of technical complexity) I don't think it says much about awareness (other than already having more tech staff) or scale.
Additionally, most companies without much technical infrastructure are less likely to be affected much in the first place.
OK, but if you're going into a business and consulting, that already suggests both a certain scale and a degree of awareness within those businesses, so this isn't likely to be a representative sample.