Well that confuses the situation. In Las Vegas, they don't have vouchers. When you redeem each day, it is four drinks so you can get a bottle of water for $7 or a specialty drink for the max $$...they each count as one. It really is not all that difficult and the bartenders will work with you to meet your needs.
This is their replacement benefit for closing Laurel Lounges in Vegas. D+ and up will still get you in the lounges that still exist elsewhere, but they're down to just a couple or few. Anyway, the reason so many people say vouchers, is because when they first started this benefit, it worked how it does now, but most of the bartenders and cashiers had trouble doing it, and it was a long process in the point of sale system, which involved printing out a receipt that would make CVS envious of its size, then you had to sign that and one other, and it just took forever. So within a couple or few months of starting the benefit, they changed it so that you had to go to promotional kiosks and print physical vouchers that had a bar code the bars could scan and do all of that stuff in the backend automatically, you sign the voucher, and it made the process run smoother once they got that refined. It was like that for most of the time it has existed, but then within the last year, they switched again to a more abbreviated version of just swiping your card and the backend system tracks it. But for 2 or 3 years, there were physical vouchers you had to print out and redeem at the bars or restaurants etc.
I'll just throw this out there - my new favorite place to use them is the little coffee shop in
Paris, Cafe Belle Madeleine, if I have them remaining near midnight and want non-alcoholic drinks like red bull and fiji for the room, which is how I use most of mine. That place has a bunch of refrigerators with beer, soft drinks, energy drinks, and prepackaged smoothie and health drinks, plus large Fiji waters (but the large size sell out every single day in my experience way before midnight). But what makes them even better is, they have a diamond and 7 stars line, and the cashier working it mostly rings up voucher drinks all day long, so they know exactly what they're doing and are quick about it. And the icing on the cake is, they'll give you a bag every time, which is a huge plus when its 11:45pm and you just want to grab 4 of something to take back to the room.
Fulton Street Food Hall at Harrah's has a smaller selection of retail drinks between the burger and pizza counters that work with vouchers, but when I stayed at Harrah's a few weeks ago, they had the gate down on the retail drinks for my entire stay, and same was true when I swung through one day between christmas and new years, so that one is unreliable, plus it tends to have a line, and no skips for diamond there, and they are hit or miss on bagging your stuff, and haven't ever had large sized Fiji any time I've gone. Montecristo at
Caesars Palace is my go to for large Fijis. They never seem to sell out, and they also have some great cocktails there. When in Rome, I'll go there and order a cocktail and 3 non-alcoholic drinks to go most of the time if it's getting near midnight and I havent used any yet.