I flew into Killeen around 2006 and it was nice. That would definitely be my preferred airport.
I remember the talk in the 80s about a regional airport. I think the hang up was that the best facility would be the old Connally AFB and of course Waco wouldn't give up its airport. I was new to the area so I didn't know much about it. In hindsight, it would have been a good thing.
I'm at a place now where, I'd much rather fly in/out of a small airport like Burbank but I need the flexibility on flights that I get out of an airport like LAX.
I used to park at The Parking Spot in LA which ran a shuttle to the terminal. Also, the Parking Spot was next to In-N-Out Burger so that was nice.
In Denver, I would park in the economy part of the parking lot but I could still walk to my car. That's the main benefit. I generally hate parking in remote lots that require a shuttle. Like I said, the Parking Spot in LA had their service down.
Another airport I've used was Palm Springs. The problem with that was the seasonal flights. I like having flights available year-round.
With the new Texas 130, it's a lot easier to get to Bergstrom now.
For a tourist flying in, I hate the extra rental car fees they hit you with in Austin but I really hate the extra fees they hit you with at DFW. I also like being able to walk to your rental car rather than take a shuttle. A train setup like at San Francisco isn't too bad. But, you still have to plan for extra time to return the car and check-in before the baggage cut-off closes.