Ah yes, that actually was available briefly during a time when Groundspeak added Waymarks as one of the items on the Google Maps which showed any listing from a Groundspeak site.
I loved it.
Then it was removed again, not sure why but I found it really interesting both for the reasons that you mentioned and also to compare locations against items that I already had been to.
Have you tried the .KML plug in for Google Earth? That works GREAT! It allows you see all Waymarks with a circle containing the Category icon... clicking it will grant access to the listing. For cluster areas, it even expands it out .... tres cool!
BQ