Damn, you're right about GIS databases. In my apps I always used lattitude first, as was taught in geography lessons, but you've convinced me to move from lattitude endian to longitude endian. Two choices - too many choices...
see: http://spatialreference.org
oregon, for instance, has two official state spatial references (if top of memory is correct).
Note that Redis Geo uses the infamous Web Mercator, used also by Microsoft Maps, Google Maps, OpenStreeMap, MapQuest, etc. but apparently rejected by the standards body EPSG with the declaration: "We will not devalue the EPSG dataset by including such inappropriate geodesy and cartography." Ouch. [1]
I always found their argument a little specious given that EPSG 4326 exists.