Well, I'd argue that RPGs are granular by definition. Everything in an RPG can be reduced to the context of an encounter. Hex maps reflect this - they may be less visually aesthetically appealing to some eyes as a result, yet I think they're a friendlier gaming tool than a freeform map because they provide easily discernable divisions of encounter locations...be they cities, lairs, or bandit encampments.without fail they look artificial, distorted and well... just plain amateurish!
Though I was around for the old Greyhawk maps, I have no fond memories as some people do. Even back then I thought "this looks rubbish" and "why couldn't they be bothered to do some real cartography". The enforced granularity of true 'hex-mapping' (cf OD&D) as opposed to hex overlays is even more sharply artificial.