This brought a smile to my face.
"WoMan _does not_ replace `man', although it does use a number of the facilities implemented in the Emacs `man' library. WoMan and man can happily co-exist, which is very useful for comparison and debugging purposes. The only way in which WoMan affects `man' is that it adds a timer to indicate how long `man' has taken to format a man page."
(From the info page for WoMan - Emacs' manual page browser).