Depending on where you are flying from....Alligaint Air flys direct flights to Sanford FL which is not a long drive down to Vero or Disney. They do not have the Magic express at Sanford, but round trip fights with Alligaint are VERY cheap sometime 100.00 both ways. Sanford also is a small airport so you can get in & out very fast......MCO can be overwelming.
Closest Airport to which Southwest flies is West Palm Beach, it is about 80 miles from Vero while Orlando airport is about 100. Thus you should check on Southwest flights to both of those airports and compare rates.