Two of us took a cab (van) from the station last summer and one earlier visit. There were plenty of cabs waiting at the station to pick up riders. We picked one with a van since it had more room. He gave us such great service we used him the entire time we were there. We split our stay between US & WDW. All we had to do was call him to arrange pickup times. He ended up giving us a discount off the meter rate. We considered renting a car but decided since we were on vacation we'd let someone else worry about traffic. We also didn't have to pay parking fees and were given door to door service.
I just realized you are coming in at the Orlando station. We came in at Kissimmee Station because our tickets were cheaper getting off at that station (go figure - we went thru Orlando to get there!). I imagine there will still be lots of cabs. You could probably also arrange with any of the other transportation companies to have someone pick you up.
Hope you enjoy your train ride.
Carolyn