SVN is a mature, easy, and simple solution. Git is wonderful, but all the improvements it brings aren't enough to actually convince IT departments to upgrade years of SVN over to Git (or to bother installing the Git-SVN bridge).
SVN gets the job done. With teams of under 10 developers on each project, SVN just works. There isn't a real bleeding need for Git's featureset, and especially if you've never used them, you probably don't know what you're missing out on. But the truth is, the answer to that is not much.
I know and have personally upgraded companies from SourceSafe to SVN..... after DVCS caught on. Sometimes the simpler solution is the safer bet, drastic change isn't always the answer and is never good for productivity, especially against a deadline as most companies and dev teams seem to be doing these days.
For myself, as a one-man dev team on projects with multiple simultaneous branches and 100k+ LOC and dozens of modules cross-linked and cross-developed......... SVN still gets the job done :)