I've been to vegas just under 20 times. Very efficient airport. Check in and security lines are very efficient at least in Terminal 3 with United and TSA pre. Years before the renovation and in the regular security line, it was never nearly as bad as they warn you.
Food options are decent with Ruby's diner, CPK, Starbucks, Port of Subs, etc.
I've never had a delay here that I can think of but I did miss an early flight leaving CES week and despite status was stuck for the entire day. Things can get a but hairy around the bigger conferences like CES and SEMA.