Not sure what other properties are doing but Mandalay Bay had a separate line for myVegas rewards at the MLife desk. We were there on Dec 29th. We stood in it for a few minutes and looking at how many people were in line and how slow it is to redeem an reward I figured it was going to be a 30-60 minute wait to redeem a couple buffet rewards. Would have saved us money but I didn't go to on vacation to wait in line so off to Dick's we went. I'm sure we had a lot more fun LOL. I can see why they did this. The normal MLife line was only a couple of people deep at the most.