All off site parking takes you to the terminal (not just specifically Jet Blue). I park at the MCO North long term parking lot and their shuttle takes you to the terminal (they will ask you what airline). Take a picture of the parking row and note what parking bus stop (A, B, C, etc) you parked in. The lot is a tad tricky to find the first run to MCO (I did it in the dark, LOL) but stay to the right entering the airport and look for the signs. Cost is $14 but there are other options see link.
Orlando Airport Parking | Cheap MCO rates from $3.99