I love YYC. It's a great airport that really represents the city well. Probably the best thing about it are those that friendly white-hatted information gurus and cart drivers. They are always able to handle any questions one might have. Sometimes they can sense when someone is struggling and will come up to you. One time I was confused about which side international arrivals would come from and a wonderful older lady asked me if I needed yelp. She was able to direct me appropriately.
I also enjoy how there are A, B, C and D meeting spots. When friends and family arrive you can tell them where to meet. Pretty easy to navigate.
That being said there is always room for improvement. The short term parking only gives you 30 mins free and then charges you an additional $3.50 (or something like that) for 30 minutes. I think they should give 45 mins because sometimes a flight can be delayed or the baggage takes longer to get out. I guess one could always drive out of the lot and loop around to get back in the lot, thus getting an additional free 30 mins, but that can be inconvenient. Also, they could have more signage about the shuttle buses that are available outside meeting place D, thus saving people money from getting a cab. However, those are relatively minor things.
It's clean, easy to navigate and has many friendly staff to help you out. The large "Welcome to Calgary" sign upon re-entry always brings a smile to my face. Feels like I am home.