Speaking from the small window of the world that I can see... tons. SuSE is the preferred distro for anything that VMWare puts out today since, you know, they own the distro. That means that all of the pre-built appliances for their management services and apps are built on SuSE. Beyond that it's the distribution that IBM uses on any strange architecture they decide to run linux on, for example Watson is SuSE running on Power. I figured it would have been AIX but I was wrong. Beyond that, I'm told that it's also the preferred internal architecture for SAP development and if they can suggest an OS to you for the app servers, that's what it is... although officially they are OS agnostic. I don't think you get near any of those things without a pretty big checkbook, so I'll go ahead and call them professional.
That is a bizarre world indeed. Since when does VMWare own SuSE? Last a heard they were bought from Novell by Attachmate, and I don't see where anything has changed there.