you can just as easily reinstall the said games in a matter of minutes since they are still on your hard drive
Agreed - quite recently I re-installed my OS (Win7) on my SSD
Steam which was living on my HD, remained. When i navigated to it and ran the exe, it complained it wasn't installed properly, offered to fix itself and did so. It then registered that all my previously installed games were installed. The games themselves however to do the initial install again, but were not needed to be downloaded again.