In the case of other tools, a lot of companies focus on useless buzzwords like "it's a cloud-enabled multi-tier architecture et cetera" instead of focusing on what the person using it cares about: "it's a content management system for blogs." OK, got it.
Again, as jwz noted, it's four things:
1. A programming language.
2. A class library.
3. A virtual machine.
4. A security model.
As a systems admin, I play mostly in 3, deploying, tuning, configuring, monitoring (to the extent that piss-poor Java tools allow any sort of monitoring -- want a dump of what's in memory? Sure ... let's just pause ALL activity on the VM for the next 25 minutes), troubleshooting, and patching/updating the VM.
I'm also concerned with the security model, within the parameters of my other system security concerns.
For the language and class libraries, it's largely ensuring that what my devs need and use is provisioned on our test, staging, and production hosts. There's also digging through some of the logging / crash / debug output to see if I can sort out what's wrong and fix it myself, or punt it over the wall to Engineering.
So no, it's not just developers.