Sure they do - all the major web servers and hosting platforms can use and define vhosts (it's just that the mechanism for creating them differs on each platform). IIS for example, if you create a new site, using "All IP Addresses" port 80, will require that you designate a host header so that the HTTP engine can route the request to the right Web Site (and corresponding content). All IP Addresses port 80 with an empty Host Header acts as a "catch-all" and is assigned to the Default Web Site. Which you generally disable, and create your own config for, if you know what you're doing. Apache, on the other hand, configures those vhosts in text files (nowadays under sites-enabled, as I recall). But the functionality is all there on pretty much all major platforms.
Now if you're arguing that the administrators of IIS servers are exponentially less likely to have a clue about host headers, when compared to their Apache/nginx counterparts - well then from my experience you're absolutely right (my history is MS consulting, and the number of IIS admins who want 20 IP addresses for 20 sites because they don't get how to do host headers, DNS resolution etc, cannot be counted - the reverse can be counted on both hands over 20 years of doing this stuff).