I miss it, too.
Las Vegas holds very little appeal to me ("you can't lose if you don't play"), but I've been there a few times, most notably helping my best friend videotape several figure skating competitions (ISI "Recreational" competitions, not the serious stuff). And being a fellow ST geek, he treated the entire crew to an evening at the "Star Trek Hilton" as I called it.
I rather enjoyed speaking Klingonaase to the Klingon wait-staff in Quark's. But I didn't go for the live gagh.
For those who didn't have the chance, or who had forgotten, the Klingon attraction was a pre-show followed by a motion simulator; the Borg attraction was a pre-show followed by a "4D" film, rather in the same vein as Disney's It's Tough to be a Bug.
I enjoyed the Klingon attraction rather more than the Borg one. Neither Borg nor "4D" shows do much for me (once was more than enough for It's Tough to be a Bug at Walt Disney World; I didn't bother with the Disney's California Adventure version at all).
Observation: When I was in Las Vegas for one of those skating competitions, held in a hotel with its own ice rink, I walked through the hotel's casino a lot. And I noticed that there were some really wacky slot machine themes (I think I saw a ST slot somewhere). Biggest surprise of all was a "Sea-Monkeys" slot machine. Who would have imagined a slot machine with a brine shrimp theme?