I used to have a one-liner until I got tired of the poor performance. On a quick test here in my PC, execpermfix took 2.7s to process a directory while find with file and grep (no chmod) took 18.5s (~5 runs). execpermfix also has better error-handling, and it only gives x where there is an r - you'll never get a "rwxr-x--x" permission. The -n and -v can be used to check for files that should have the permission. The default quiet mode follows the unix philosophy.
I think it has its value, and I always use it after updating legacy (big) CVS repositories.
