Thanks guys, I'll just be employing the suggestion to use other tools to format the card aside from EaseUS. I'll also try out Airdroid, but hearsay tells me that there are some compatibility issues there as well.
For anyone else who might be reading this and wondering, I can't say for certain if the S3 is cut out for use with exfat SD cards since my friend is having a dandy time with his perfectly-functioning Sandisk, exfat, 64 gig card and Galaxy S3 from Sprint. We both have the Sprint models and the same kind of SD card. There seems to be a point where success with this technology can be on an individual level, since my friend disregards my advice to format his card to FAT32 as I cite this topic to him.