Although arrival and check-in is currently unchanged, I was pleasantly surprised by the new LGA concourse on two recent visits. You really won't think you're at LGA. Nice!

As mentioned above, the bathrooms behind Shake Shack are massive, new and clean. Bathrooms were always jammed in the old LGA.

I didn't visit the UC, but the MLL is very nice (and quiet). Food and coffee options are basic, but decent.