Nashville and Orlando are pretty different places, so if I were you I would sit and down and see what you are really looking for in a town and go from there.
That being said, I live in Orlando, well techinally Oviedo but really I'm about 10 minutes from Orlando. I would personally never move to Orange County, it is so congested and busy all the time that I couldn't handle it. We live in Seminole County and it much nicer. Very clean, nice people and good schools. The job market is extremely harsh down here right now, there are pretty much no jobs, period. The schools are having major cutbacks (Orange County). As for the good points, being near Disney is one of those things that people always say "wow you're so lucky". I don't go too often anymore for finacial reasons, and there is only a few months out of the year I find it most enjoyable (low crowds, cool weather). Traffic is a HUGE problem, I-4 is crazy busy, but I guess thats suspectible with any busy city. Here in Seminole County we don't have tourists, they usually stay closer to the theme park areas. I moved up here for school and will be moving back to south florida after this semester because we don't like the general area of central Florida. Not to many community type events to attend or a sense of "neighborhood", like where I'm from. But who knows, it might float your boat?!
But like another poster said, it's really where in Orlando you plan on moving. There are some really nice cities further north from Orlando that are really nice.