We've used the limo for the last two years. It's well worth the money in our opinion.
Travel door-to-door in air conditioned luxury!!
You can arrange for it to pick you up from any of the parks for the return journey to the airport as well.
The driver will meet you as you pick up your cases and help you get them to the car. Sometimes there are soft drinks in the cooler for you to use.
...And just watch everyone turn thier heads as you turn up at the hotel!
Do it. It's worth it!