Open 24/7, The Henry is always a great option for casual dining (plus full bar of course), especially when a guest at The Cosmo. It's very convenient, the staff is friendly (albeit never in much of a rush), the food is consistent, the variety is vast, and you can get the Breakfast Plate anytime - score!
The prices are reasonable for the Vegas Strip and people watching is free. The Henry is completely open concept and located at the very end of the casino, so there's not a bad seat in the house so-to-speak. Depending on the time, you can see talent dancing on top of the casino bars under disco balls or just watch the delightfully intoxicated folks stumble in off The Strip.
Bottom-line: A very good option when in need/desire of some sustenance and a Secret Pizza slice just won't cut it. ;)
Recommend bang for the buck$: Breakfast plate and they do a Burger quite well. Enjoy!