defaults delete com.apple.dock autohide-time-modifier; killall Dock
to get back to the default setting.
In my cursory research, the time values were expressed as floats rather than ints. I assume your version is like using 0 or 1 when a Boolean value is expected (i.e. the int is coerced to a float).
dkmarsh—member, FineTunedMac Co-op Board of Directors
