I've read if you go close to when they stop serving lunch you can eat lunch and if you sit at the table and wait you can get dinner for free. The dinner's like $10 more than lunch so this is quite the deal. I went there for lunch, and I know people say "ZOMG CESARS BUFFET IS TEH BEST EVAR!" I haven't eaten it to compare, but Wynn's was fucking amazing. I've heard the dinner's even more epic. And it's not that expensive considering how good it is. I had the Luxor buffet = SHIT. Mandalay Bay buffet = worse than Luxor. And they were something like $25-30 each. Wynn was worth the extra money.
If the waiting for dinner trick's true, I wish I had known about it when I was there