I use uber at home in DC (I haven't in WDW because I always take Magical Express) and I love it. It's more affordable than a cab, it's always been a nicer car, and easier to get. Just use the app and it'll estimate the fare for you before you request the car so you'll know how much you're paying in advance. The estimate has always been accurate for me.
One addition--I don't know if they pick up from MCO. Some airports don't allow non-licensed taxis to pick up but they can drop off.