I have used Uber from airport to port in Houston/Galveston. It was fine, but a couple of things to consider:
- We needed UberXL for three people and our luggage for our 7-night cruise, which was significantly more expensive than regular Uber.
- We didn't end up Uber-ing back after the cruise because with two ships in port, surge pricing would have been (and ended up being) in place at that moment.
- The cost of Galveston Express (shared shuttle) was actually slightly less than UberXL. We tried that on the way back and thought it was a good option.
So, although this is maybe too Galveston-specific, it might be applicable to other ports, as well.