Does "repair disk" or boot from OS fix anything even if nothing wrong found?

My mac was freezing a lot lately, and when I did "verify disk" it told me something like it needed to be repaired and booted from the OS dvd.
so I did that, and did "repair disk", but it found nothing wrong.
so I just restored everything from my time machine backup.
should this process have fixed anything or should I expect nothing has changed?
macbook 2007 10.6

You might want to consider running the combo updater over your install to refresh your files.
Combo updater: Mac OS X 10.6.8 Update v.1.1 - 1.09 GB
http://support.apple.com/kb/DL1399
MORE INFO ON WHY RUNNING COMBO FIXES ISSUES
Apple updates available from the Software Update application are incremental updates. Delta updates are also incremental updates and are available from Apple Downloads (software updates are generally smaller than delta updates). The Combo updates contain all incremental updates and will update files that could have become corrupted.
Combo updaters will install on the same version as they're applying--no need to roll back or do a clean install. So if you think you've got a borked 10.6.8 install from a regular update, just run the 10.6.8 Combo Updater on that system.
"Delta" updaters can only take you from one version to the next. For example: 10.6.7 to 10.6.8. If somehow the 10.6.8 is missing something it should have, and that something isn't changed between 10.6.7 and 10.6.8 it will still be stale after the delta update.

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