I love Las Vegas! I live in northern San Diego, and the drive to Vegas can be a 5 hour drive. With traffic, it can definitely be longer, especially the trip back to San Diego. The flight from sd to Vegas is approximately 50 minutes.
I came in on a Tuesday night so it wasn't too busy. There was no cab line but it looks like it can get long. It looks like the line to get into Splash Mountain at Disneyland! I've been told the line goes by fast though. The cab ride to the Cosmopolitan Hotel was about 17 bucks.
I had time to eat while waiting for my flight to go back home. The airport is pretty big and there's a few food choices. I was debating on Nathan's or Popeyes. I ended up getting Popeyes and it didn't disappoint.
Unfortunately, this airport isn't new enough where there are outlets next to the seats waiting at your gate. There are few charging stations if you need to charge your phone. I'm assuming on a busy day it can get hard to get a plug. Just try to have a full charge when you get here.
And yes, there are slot machines at the airport!