We've been to Disney many, many times.  Most times, we drive - its about 11 hours for us (and you lose an hour going there).  We usually try to leave around 3:00 AM, and we usually get there around 3:00 PM.  We stop for lunch (quick & cheap) and it really isn't a bad drive.  
The kids have been doing it since they were a year old and we make the most out of our family time!
If we fly, its only about an hour and  a half flight, but again, if you're flying five people, that's a lot of money!
We're driving down for our "Christmas trip" this year.  We've been adding a "Christmas" trip the last two years, but this year, we're trying to save a little.  So, we'll drive down on Wed afternoon/night, arrive early Thurs morning.  We'll do the drive back on Sunday!  Can't wait!!