I am frequently in and out of Sky Harbor both as a traveler and for pick up/drop off. I've been flying since I was in the womb and I've been to more airports around the country and world than I've been in shopping malls (true story) so when I say this is the BEST airport I've been in, that should carry some weight.
The departure/arrivals area of each terminal is generally very accessible. Thank you, Phoenix, for not implementing annoying security guards to tell me I can't wait at the curb 2 minutes for my arriving guests when i know theyre on their way out like some airports do (Indianapolis International is horrible about this practice). It makes it much easier when I don't have to circle the airport again.
The concourses allow for a multitude of people which is great. There's really no way to make an airport terminal not claustrophobic because crowds happen but Sky Harbor does a nice job of keeping the flow. The moving sidewalks are great for long treks and I've never waited longer than 10 mins in security lines even the day before Thanksgiving!!!
My only beef is that recently, they've removed more affordable fast food restaurants from the Southwest concourses. I get it: support local restaurants and cafes and be healthier. No seriously, I love me some local Phoenix businesses and I appreciate a good, healthy meal option. But when I have a 5am flight that's about to be a 6 hour hike back to the east coast, I just want a $3 egg biscuit from McDonalds, not a $15 breakfast burrito I could have gotten for $4 at Fili-Bs. But that's really my only complaint because I am a miserly early AM traveler.
Keep doing what you're doing, Sky Harbor. You make flying a more enjoyable experience for this frequent traveler and pick-up/drop-off extraordinaire.