I have a friend who is somewhat sad that one shouldn't defrag an SSD, and also seems to enjoy just watching the process run. I never understood the obsession with it, unless there was a proven benefit. And it's only been in rare cases where I've seen a benefit.

Back prior to switching all our programmers to SSDs, defragging the programmers code drives did help quite a bit both with ensuring Visual Studio ran a little better. It also ensured the game would load faster when they went to debug. Perforce + NTFS + code compile = fragment hell. Diskeeper seemed to work well, with most programmers having enough idle time at lunch to fix up the drive after the morning sync and compile.