DCL transportation is the best way to be guaranteed you get on the ship - either at the embarkation port or the next port. Boy, I hope that’s true. Pretty sure that happens on excursions.
For some group sizes, there may be less expensive options. And for those who don’t like buses or have difficulty climbing up the stairs into them, alternatives are available. Other shuttle/ bus companies, rideshare, rental cars.
It also depends on where you stay pre-cruise and when you arrive.
We did the Hyatt hotel inside MCO + DCL bus (dedicated to the Hyatt) on our last cruise due to a flight arrival after midnight.
If you want to take advantage of the free check-in day Water Park admission at WDW resorts in 2025, you could take DCL transportation from the resort to the port for Boarding. There is no more free Magical Express between airport and WDW.
(My choice - if rental car price is good, would be fly in early the day before cruise, stay at a WDW resort. Do the water park, then drive to the ship the following day.)
If staying near the airport, DCL buses leave from the ground floor of the main terminal. Most hotels have free airport >< hotel shuttles.
And some guests like to stay close to Port Canaveral. That pretty much means a rental car or rideshare. The hotels don’t have a lot of walking-distance restaurants. Maybe in Cocoa Beach, itself.
One-way rentals to Cape Canaveral (official address for these) have a high turnaround, so there usually is not the added drop-off fee. Rental locations are within 1-5 miles from the port and offer shuttles.
Happy Planning!
Happy Anticipation!