Gonna drop a goodie here, since I was looking for it relentlessly after losing the browser i'd been using for so long. Copypasta this useful little bit of code into the Custom CSS textbox under the Theme sub-tab in the options menu.

It allows you to visibly display post count of all users next to their ID, instead of having to hover over the ID:

.posts_by_id{

display:initial!important;

}