Within a business, security has to be understood in the context of risk analysis. Will the measures taken damage the company more than the benefit of the increased security? In my eyes, banning storage media without a practical replacement is on the wrong side of the risk analysis equation. Sure, it's not desirable that files can be moved without full access control and auditing, but if people don't have a tool that…
With the rise of VPNs, fast home internet, and fairly ubiquitous public wifi along with laptops gaining enough power for most applications the question is what's the real use case that requires removable media that can't be accomplished with an internal FTP/network drive/email and using company laptops?
If I'm giving a presentation to hundreds or thousands of people in 30 minutes and a laptop goes down/won't connect to projector, presentation wasn't loaded or was corrupted on the speaker laptop, things go sideways in a bunch of other ways (and they do), I don't want to be in the position of depending on the network to pull down a presentation from somewhere. Especially if I don't have my own laptop with me as is at least sometimes the case.
There should be various other ways to get to a presentation and I even have a setup to present from my iPhone (which I've actually had to use as a fallback), but a USB stick is a good, simple backup that I've used more than once.