We've only been going since 2002 and have a tremendous difference. The douchebaggery level on the Strip is beyond bad, the panhandlers and time share folks (I don't differentiate between the 2) practically assault you, and the overall vibe of the place is different. Seems like the douchebag "club" crowd is who they cater to now.
We stay on the Strip in summer because of the pools, and we like the restaurants and many of the shows, so we know the downside of Strip life. When gambling, we go off Strip to places like Fremont, Sam's Town, and a few of the Station casinos. My wife finally played 3-card on our last trip and the dealers off the Strip (as well as the other folks at the table) couldn't be nicer. She hit a straight flush and everybody cheered. Never had any such experience on the Strip...
Anyway, I'm complaining about a place we love to go, and we still do love it for the most part... Like I said, just a different feel now than 11 years ago for sure.
Bushman