Hi James, welcome to the iNat Forum! I think the only location on the website that pinned locations are currently searchable is on the observation upload page, e.g.:
As long as your observations have open geoprivacy, you can use the Explore page to zoom into a particular location and click “Redo search in map” to achieve a similar effect to searching for a particular pinned location, e.g.:
Regarding viewing the true location of your obscured observations, see this related feature request: https://forum.inaturalist.org/t/view-true-locations-on-maps-for-observations-with-trusted-hidden-coordinates/2568
I don’t use pinned locations very frequently, but I do bookmark these types of filtered searches for observations in places of personal interest, just as browser bookmarks.