I'm not gonna lie, I got pretty lucky. I've been living at my house in Summerlin for 7 or 8 years now, and anytime I had to go to the airport, I'd bother someone to give me a ride (30 minutes) or I'd drive my car and park it at (or near) the airport. Both are annoying solutions.
So last year they built the Westcliff Transit Center, about a mile from my house, and the WAX bus takes you all the way to the airport for $2. I'm a fan!
It's not the biggest or the best bus station, but it's new and pretty easy to navigate. And there's a great convenient store/gas station across the street.