Using `display: table` is a great way to lay out your elements in a grid while keeping your HTML semantic.
Besides, these companies have absolutely zero valid reasons to keep using this crutch - it's severely outdated, a giant gaping security hole and a hindrance to the entire world wide web.
And no, legacy applications built upon IE6 on which some corporations have based their entire internal communication (or other things) are not an argument for supporting IE6, but instead gives us all the more reason to force them to get rid of it.