When entering related places using a relationship to the TGN hierarchy (rather than geolocation, say), it can be difficult to tell which entry to use without a map there to point out which place is which. See the attached photos.
Step1 shows me typing in "Paris" and the result set that comes through.
Step2 then shows me having selected Pere Lachaise.
As for how I might think this would be better... Personally? I'd stick the TGN hierarchy search over the hierarchy over a map (pretty much as it is organized in the geolocation module), then when you select the item in the pulldown search, it shows you the location in the hierarchy AND shows you that place on the map.
Just my two-cents-worth...