My wife and I started coming to Vegas in the mid 90's because it was cheap to fly to and rent a car to go into Utah to see family there. We had 1 kid and then more. If we stayed overnight, it was at Excalibur. We did stay at Monte Carlo once. Pools and entertainment were nice for the kids. We didn't even gamble then.
We continued to come after that(w/o the kids) and gambled a little. Just enjoyed the cheap food, the lights and really the rush of Vegas during that time. Unique properties, free dice or decks of cards etc.
Starting in the 2000's my employer would send me to conferences in Vegas periodically. My wife always joined. She played slots and I would play live poker(Hold em). We still enjoyed the food and shows.
As time has gone by(40, maybe 50+ trips), we learned to play VP, so that our bankrolls would align better(she tended to lose quickly on the slots, while my bankroll at Hold em, craps or BJ would last far longer) and we could play together. Hit my first royal with her sitting next to me about 1 am at the Boar's Head Bar at MSS when they still had 9/6 JOB and you got a scratch card for 4 of a kinds.
We still go today and still both play VP and some BJ. I love doing the trips with her, and at this point wouldn't do it any other way. We are best friends(after some tough years, but that's how marraige goes) and love doing Vegas and travelling elsewhere together.
Great topic. Lots of interesting answers.