Depends on how many are in your group, and the type of transport you want. I have used the Mears shuttle before, when heading to the S/D. It is about $32 r/t, pp. It isn't the fastest way to get to WDW, but it does work. It took me about 85 mins to get to the Swan. I was in a van, not the bus..and we made about 5 stops total..it was kind of interesting to see other areas of Orlando, and there were some really nice people to talk to.
Or, you can book a car service. That will run you about $100-120 r/t, for up to 4 or 5 people. Very quick...they meet you in baggage claim, help you with your bags and then go right to your resort.
Or, you can rent a car at MCO.
If there are only two of you, it may be better to go with Mears..half the price of a car service. But if you want fast, go with a car service. That will take about an hour total.